Merge branch 'main' into allowStaticFileOverrides

Show uneditable annotations on viewer
show editable annotations layer when in annotation tools (sign, add
image, add text)
Remove draw tool from viewer (this is replaced wholesale in an upcoming
PR so it wasn't worth doing the work to ensure it worked with the new
annotation layer set up_)
refactoring work, mostly renaming variables we can use for all
annotation based tools that had sign specific names.
remove "tools" tooltip

---------

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

.github/workflows/PR-Auto-Deploy-V2.yml

@@ -52,7 +52,6 @@ jobs:
             core.setOutput('repository', pr.head.repo.full_name);
             core.setOutput('ref', pr.head.ref);
             core.setOutput('is_fork', String(pr.head.repo.fork));
-            core.setOutput('base_ref', pr.base.ref);
             core.setOutput('author', pr.user.login);
             core.setOutput('state', pr.state);
 
@@ -65,10 +64,6 @@ jobs:
           IS_FORK: ${{ steps.resolve.outputs.is_fork }}
           # nur bei workflow_dispatch gesetzt:
           ALLOW_FORK_INPUT: ${{ inputs.allow_fork }}
-          # für Auto-PR-Logik:
-          PR_TITLE: ${{ github.event.pull_request.title }}
-          PR_BRANCH: ${{ github.event.pull_request.head.ref }}
-          PR_BASE: ${{ steps.resolve.outputs.base_ref }}
           PR_AUTHOR: ${{ steps.resolve.outputs.author }}
         run: |
           set -e
@@ -89,14 +84,8 @@ jobs:
           else
             auth_users=("Frooodle" "sf298" "Ludy87" "LaserKaspar" "sbplat" "reecebrowne" "DarioGii" "ConnorYoh" "EthanHealy01" "jbrunton96" "balazs-szucs")
             is_auth=false; for u in "${auth_users[@]}"; do [ "$u" = "$PR_AUTHOR" ] && is_auth=true && break; done
-            if [ "$PR_BASE" = "V2" ] && [ "$is_auth" = true ]; then
+            if [ "$is_auth" = true ]; then
               should=true
-            else
-              title_has_v2=false; echo "$PR_TITLE" | grep -qiE 'v2|version.?2|version.?two' && title_has_v2=true
-              branch_has_kw=false; echo "$PR_BRANCH" | grep -qiE 'v2|react' && branch_has_kw=true
-              if [ "$is_auth" = true ] && { [ "$title_has_v2" = true ] || [ "$branch_has_kw" = true ]; }; then
-                should=true
-              fi
             fi
           fi
 
@@ -174,7 +163,7 @@ jobs:
               owner,
               repo,
               issue_number: prNumber,
-              body: `🚀 **Auto-deploying V2 version** for PR #${prNumber}...\n\n_This is an automated deployment triggered by V2/version2 keywords in the PR title or V2/React keywords in the branch name._\n\n⚠️ **Note:** If new commits are pushed during deployment, this build will be cancelled and replaced with the latest version.`
+              body: `🚀 **Auto-deploying V2 version** for PR #${prNumber}...\n\n_This is an automated deployment for approved V2 contributors._\n\n⚠️ **Note:** If new commits are pushed during deployment, this build will be cancelled and replaced with the latest version.`
             });
             return newComment.id;
 
@@ -394,7 +383,7 @@ jobs:
                               `🔗 **Direct Test URL (non-SSL)** [${deploymentUrl}](${deploymentUrl})\n\n` +
                               `🔐 **Secure HTTPS URL**: [${httpsUrl}](${httpsUrl})\n\n` +
                               `_This deployment will be automatically cleaned up when the PR is closed._\n\n` +
-                              `🔄 **Auto-deployed** because PR title or branch name contains V2/version2/React keywords.`;
+                              `🔄 **Auto-deployed** for approved V2 contributors.`;
 
             await github.rest.issues.createComment({
               owner,

.github/workflows/PR-Demo-Comment-with-react.yml

@@ -14,6 +14,7 @@ jobs:
     permissions:
       issues: write
     if: |
+      vars.CI_PROFILE != 'lite' &&
       github.event.issue.pull_request &&
       (
         contains(github.event.comment.body, 'prdeploy') ||

.github/workflows/build.yml

@@ -262,7 +262,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        docker-rev: ["docker/embedded/Dockerfile", "docker/embedded/Dockerfile.ultra-lite", "docker/embedded/Dockerfile.fat"]
+        include:
+          - docker-rev: docker/embedded/Dockerfile
+            artifact-suffix: Dockerfile
+          - docker-rev: docker/embedded/Dockerfile.ultra-lite
+            artifact-suffix: Dockerfile.ultra-lite
+          - docker-rev: docker/embedded/Dockerfile.fat
+            artifact-suffix: Dockerfile.fat
     steps:
       - name: Harden Runner
         uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
@@ -272,6 +278,13 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
+      - name: Free disk space on runner
+        run: |
+          echo "Disk space before cleanup:" && df -h
+          sudo rm -rf /usr/share/dotnet /opt/ghc /usr/local/lib/android /usr/local/share/boost
+          docker system prune -af || true
+          echo "Disk space after cleanup:" && df -h
+
       - name: Set up JDK 17
         uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5.0.0
         with:
@@ -313,7 +326,7 @@ jobs:
         if: always()
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         with:
-          name: reports-docker-${{ matrix.docker-rev }}
+          name: reports-docker-${{ matrix.artifact-suffix }}
           path: |
             build/reports/tests/
             build/test-results/

.github/workflows/multiOSReleases.yml

@@ -31,6 +31,7 @@ permissions:
 
 jobs:
   determine-matrix:
+    if: ${{ vars.CI_PROFILE != 'lite' }}
     runs-on: ubuntu-latest
     outputs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}

.github/workflows/push-docker-v2.yml

@@ -24,6 +24,7 @@ permissions:
 
 jobs:
   push:
+    if: ${{ vars.CI_PROFILE != 'lite' }}
     runs-on: ubuntu-24.04-8core
     permissions:
       packages: write

.github/workflows/push-docker.yml

@@ -24,6 +24,7 @@ permissions:
 
 jobs:
   push:
+    if: ${{ vars.CI_PROFILE != 'lite' }}
     runs-on: ubuntu-latest
     permissions:
       packages: write

.github/workflows/scorecards.yml

@@ -17,6 +17,7 @@ permissions: read-all
 
 jobs:
   analysis:
+    if: ${{ vars.CI_PROFILE != 'lite' }}
     name: Scorecard analysis
     runs-on: ubuntu-latest
     permissions:

.github/workflows/sonarqube.yml

@@ -27,6 +27,7 @@ permissions:
 
 jobs:
   sonarqube:
+    if: ${{ vars.CI_PROFILE != 'lite' }}
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner

.github/workflows/stale.yml

@@ -10,6 +10,7 @@ permissions:
 
 jobs:
   stale:
+    if: ${{ vars.CI_PROFILE != 'lite' }}
     runs-on: ubuntu-latest
     permissions:
       issues: write

.github/workflows/swagger.yml

@@ -23,6 +23,7 @@ permissions:
 
 jobs:
   push:
+    if: ${{ vars.CI_PROFILE != 'lite' }}
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner

.github/workflows/tauri-build.yml

@@ -28,6 +28,7 @@ permissions:
 
 jobs:
   determine-matrix:
+    if: ${{ vars.CI_PROFILE != 'lite' }}
     runs-on: ubuntu-latest
     outputs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
@@ -636,6 +637,8 @@ jobs:
           if [ "${{ needs.build.result }}" = "success" ]; then
             echo "✅ All Tauri builds completed successfully!"
             echo "Artifacts are ready for distribution."
+          elif [ "${{ needs.build.result }}" = "skipped" ]; then
+            echo "⏭️  Tauri builds skipped (CI lite mode enabled)"
           else
             echo "❌ Some Tauri builds failed."
             echo "Please check the logs and fix any issues."

.github/workflows/testdriver.yml

@@ -21,6 +21,7 @@ permissions:
 
 jobs:
   deploy:
+    if: ${{ vars.CI_PROFILE != 'lite' }}
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner

app/common/src/main/java/stirling/software/SPDF/config/EndpointConfiguration.java

@@ -491,6 +491,9 @@ public class EndpointConfiguration {
         addEndpointToGroup("Ghostscript", "repair");
         addEndpointToGroup("Ghostscript", "compress-pdf");
 
+        /* ImageMagick */
+        addEndpointToGroup("ImageMagick", "compress-pdf");
+
         /* tesseract */
         addEndpointToGroup("tesseract", "ocr-pdf");
 
@@ -574,6 +577,7 @@ public class EndpointConfiguration {
                 || "Javascript".equals(group)
                 || "Weasyprint".equals(group)
                 || "Pdftohtml".equals(group)
+                || "ImageMagick".equals(group)
                 || "rar".equals(group);
     }
 

app/common/src/main/java/stirling/software/common/model/ApplicationProperties.java

@@ -68,6 +68,7 @@ public class ApplicationProperties {
 
     private AutoPipeline autoPipeline = new AutoPipeline();
     private ProcessExecutor processExecutor = new ProcessExecutor();
+    private PdfEditor pdfEditor = new PdfEditor();
 
     @Bean
     public PropertySource<?> dynamicYamlPropertySource(ConfigurableEnvironment environment)
@@ -100,6 +101,46 @@ public class ApplicationProperties {
         private String outputFolder;
     }
 
+    @Data
+    public static class PdfEditor {
+        private Cache cache = new Cache();
+        private FontNormalization fontNormalization = new FontNormalization();
+        private CffConverter cffConverter = new CffConverter();
+        private Type3 type3 = new Type3();
+        private String fallbackFont = "classpath:/static/fonts/NotoSans-Regular.ttf";
+
+        @Data
+        public static class Cache {
+            private long maxBytes = -1;
+            private int maxPercent = 20;
+        }
+
+        @Data
+        public static class FontNormalization {
+            private boolean enabled = false;
+        }
+
+        @Data
+        public static class CffConverter {
+            private boolean enabled = true;
+            private String method = "python";
+            private String pythonCommand = "/opt/venv/bin/python3";
+            private String pythonScript = "/scripts/convert_cff_to_ttf.py";
+            private String fontforgeCommand = "fontforge";
+        }
+
+        @Data
+        public static class Type3 {
+            private Library library = new Library();
+
+            @Data
+            public static class Library {
+                private boolean enabled = true;
+                private String index = "classpath:/type3/library/index.json";
+            }
+        }
+    }
+
     @Data
     public static class Legal {
         private String termsAndConditions;
@@ -112,7 +153,6 @@ public class ApplicationProperties {
     @Data
     public static class Security {
         private Boolean enableLogin;
-        private Boolean csrfDisabled;
         private InitialLogin initialLogin = new InitialLogin();
         private OAUTH2 oauth2 = new OAUTH2();
         private SAML2 saml2 = new SAML2();
@@ -358,6 +398,7 @@ public class ApplicationProperties {
         private Boolean enableAnalytics;
         private Boolean enablePosthog;
         private Boolean enableScarf;
+        private Boolean enableDesktopInstallSlide;
         private Datasource datasource;
         private Boolean disableSanitize;
         private int maxDPI;
@@ -368,10 +409,12 @@ public class ApplicationProperties {
         private TempFileManagement tempFileManagement = new TempFileManagement();
         private DatabaseBackup databaseBackup = new DatabaseBackup();
         private List<String> corsAllowedOrigins = new ArrayList<>();
-        private String
-                frontendUrl; // Base URL for frontend (used for invite links, etc.). If not set,
+        private String backendUrl; // Backend base URL for SAML/OAuth/API callbacks (e.g.
+        // 'http://localhost:8080', 'https://api.example.com'). Required for
+        // SSO.
+        private String frontendUrl; // Frontend URL for invite email links (e.g.
 
-        // falls back to backend URL.
+        // 'https://app.example.com'). If not set, falls back to backendUrl.
 
         public boolean isAnalyticsEnabled() {
             return this.getEnableAnalytics() != null && this.getEnableAnalytics();
@@ -536,6 +579,7 @@ public class ApplicationProperties {
         @ToString.Exclude private String key;
         private String UUID;
         private String appVersion;
+        private Boolean isNewServer;
     }
 
     // TODO: Remove post migration
@@ -575,6 +619,16 @@ public class ApplicationProperties {
         private String username;
         @ToString.Exclude private String password;
         private String from;
+        // STARTTLS upgrades a plain SMTP connection to TLS after connecting (RFC 3207)
+        private Boolean startTlsEnable = true;
+        private Boolean startTlsRequired;
+        // SSL/TLS wrapper for implicit TLS (typically port 465)
+        private Boolean sslEnable;
+        // Hostnames or patterns (e.g., "smtp.example.com" or "*") to trust for TLS certificates;
+        // defaults to "*" (trust all) when not set
+        private String sslTrust;
+        // Enables hostname verification for TLS connections
+        private Boolean sslCheckServerIdentity;
     }
 
     @Data
@@ -643,6 +697,7 @@ public class ApplicationProperties {
             private int weasyPrintSessionLimit;
             private int installAppSessionLimit;
             private int calibreSessionLimit;
+            private int imageMagickSessionLimit;
             private int qpdfSessionLimit;
             private int tesseractSessionLimit;
             private int ghostscriptSessionLimit;
@@ -680,6 +735,10 @@ public class ApplicationProperties {
                 return calibreSessionLimit > 0 ? calibreSessionLimit : 1;
             }
 
+            public int getImageMagickSessionLimit() {
+                return imageMagickSessionLimit > 0 ? imageMagickSessionLimit : 4;
+            }
+
             public int getGhostscriptSessionLimit() {
                 return ghostscriptSessionLimit > 0 ? ghostscriptSessionLimit : 8;
             }
@@ -709,6 +768,8 @@ public class ApplicationProperties {
             @JsonProperty("calibretimeoutMinutes")
             private long calibreTimeoutMinutes;
 
+            private long imageMagickTimeoutMinutes;
+
             private long tesseractTimeoutMinutes;
             private long qpdfTimeoutMinutes;
             private long ghostscriptTimeoutMinutes;
@@ -746,6 +807,10 @@ public class ApplicationProperties {
                 return calibreTimeoutMinutes > 0 ? calibreTimeoutMinutes : 30;
             }
 
+            public long getImageMagickTimeoutMinutes() {
+                return imageMagickTimeoutMinutes > 0 ? imageMagickTimeoutMinutes : 30;
+            }
+
             public long getGhostscriptTimeoutMinutes() {
                 return ghostscriptTimeoutMinutes > 0 ? ghostscriptTimeoutMinutes : 30;
             }

app/common/src/main/java/stirling/software/common/service/LineArtConversionService.java

@@ -0,0 +1,12 @@
+package stirling.software.common.service;
+
+import java.io.IOException;
+
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
+
+public interface LineArtConversionService {
+    PDImageXObject convertImageToLineArt(
+            PDDocument doc, PDImageXObject originalImage, double threshold, int edgeLevel)
+            throws IOException;
+}

app/common/src/main/java/stirling/software/common/service/PostHogService.java

@@ -254,10 +254,7 @@ public class PostHogService {
                 properties,
                 "security_enableLogin",
                 applicationProperties.getSecurity().getEnableLogin());
-        addIfNotEmpty(
-                properties,
-                "security_csrfDisabled",
-                applicationProperties.getSecurity().getCsrfDisabled());
+        addIfNotEmpty(properties, "security_csrfDisabled", true);
         addIfNotEmpty(
                 properties,
                 "security_loginAttemptCount",

app/common/src/main/java/stirling/software/common/util/ProcessExecutor.java

@@ -86,6 +86,11 @@ public class ProcessExecutor {
                                                 .getProcessExecutor()
                                                 .getSessionLimit()
                                                 .getCalibreSessionLimit();
+                                case IMAGEMAGICK ->
+                                        applicationProperties
+                                                .getProcessExecutor()
+                                                .getSessionLimit()
+                                                .getImageMagickSessionLimit();
                                 case GHOSTSCRIPT ->
                                         applicationProperties
                                                 .getProcessExecutor()
@@ -141,6 +146,11 @@ public class ProcessExecutor {
                                                 .getProcessExecutor()
                                                 .getTimeoutMinutes()
                                                 .getCalibreTimeoutMinutes();
+                                case IMAGEMAGICK ->
+                                        applicationProperties
+                                                .getProcessExecutor()
+                                                .getTimeoutMinutes()
+                                                .getImageMagickTimeoutMinutes();
                                 case GHOSTSCRIPT ->
                                         applicationProperties
                                                 .getProcessExecutor()
@@ -301,6 +311,7 @@ public class ProcessExecutor {
         WEASYPRINT,
         INSTALL_APP,
         CALIBRE,
+        IMAGEMAGICK,
         TESSERACT,
         QPDF,
         GHOSTSCRIPT,

app/common/src/main/java/stirling/software/common/util/RequestUriUtils.java

@@ -26,6 +26,7 @@ public class RequestUriUtils {
                 || normalizedUri.startsWith("/public/")
                 || normalizedUri.startsWith("/pdfjs/")
                 || normalizedUri.startsWith("/pdfjs-legacy/")
+                || normalizedUri.startsWith("/pdfium/")
                 || normalizedUri.startsWith("/assets/")
                 || normalizedUri.startsWith("/locales/")
                 || normalizedUri.startsWith("/Login/")
@@ -61,7 +62,8 @@ public class RequestUriUtils {
                 || normalizedUri.endsWith(".css")
                 || normalizedUri.endsWith(".mjs")
                 || normalizedUri.endsWith(".html")
-                || normalizedUri.endsWith(".toml");
+                || normalizedUri.endsWith(".toml")
+                || normalizedUri.endsWith(".wasm");
     }
 
     public static boolean isFrontendRoute(String contextPath, String requestURI) {
@@ -125,11 +127,13 @@ public class RequestUriUtils {
                 || requestURI.endsWith("popularity.txt")
                 || requestURI.endsWith(".js")
                 || requestURI.endsWith(".toml")
+                || requestURI.endsWith(".wasm")
                 || requestURI.contains("swagger")
                 || requestURI.startsWith("/api/v1/info")
                 || requestURI.startsWith("/site.webmanifest")
                 || requestURI.startsWith("/fonts")
-                || requestURI.startsWith("/pdfjs"));
+                || requestURI.startsWith("/pdfjs")
+                || requestURI.startsWith("/pdfium"));
     }
 
     /**
@@ -162,10 +166,9 @@ public class RequestUriUtils {
                 // enableLogin)
                 || trimmedUri.startsWith(
                         "/api/v1/ui-data/footer-info") // Public footer configuration
-                || trimmedUri.startsWith("/v1/api-docs")
                 || trimmedUri.startsWith("/api/v1/invite/validate")
                 || trimmedUri.startsWith("/api/v1/invite/accept")
-                || trimmedUri.contains("/v1/api-docs");
+                || trimmedUri.startsWith("/v1/api-docs");
     }
 
     private static String stripContextPath(String contextPath, String requestURI) {

app/common/src/test/java/stirling/software/common/util/RequestUriUtilsTest.java

@@ -24,6 +24,9 @@ public class RequestUriUtilsTest {
         assertTrue(
                 RequestUriUtils.isStaticResource("/pdfjs/pdf.worker.js"),
                 "PDF.js files should be static");
+        assertTrue(
+                RequestUriUtils.isStaticResource("/pdfium/pdfium.wasm"),
+                "PDFium wasm should be static");
         assertTrue(
                 RequestUriUtils.isStaticResource("/api/v1/info/status"),
                 "API status should be static");
@@ -110,7 +113,8 @@ public class RequestUriUtilsTest {
                 "/downloads/document.png",
                 "/assets/brand.ico",
                 "/any/path/with/image.svg",
-                "/deep/nested/folder/icon.png"
+                "/deep/nested/folder/icon.png",
+                "/pdfium/pdfium.wasm"
             })
     void testIsStaticResourceWithFileExtensions(String path) {
         assertTrue(
@@ -148,6 +152,9 @@ public class RequestUriUtilsTest {
         assertFalse(
                 RequestUriUtils.isTrackableResource("/script.js"),
                 "JS files should not be trackable");
+        assertFalse(
+                RequestUriUtils.isTrackableResource("/pdfium/pdfium.wasm"),
+                "PDFium wasm should not be trackable");
         assertFalse(
                 RequestUriUtils.isTrackableResource("/swagger/index.html"),
                 "Swagger files should not be trackable");
@@ -224,7 +231,8 @@ public class RequestUriUtilsTest {
                 "/api/v1/info/health",
                 "/site.webmanifest",
                 "/fonts/roboto.woff",
-                "/pdfjs/viewer.js"
+                "/pdfjs/viewer.js",
+                "/pdfium/pdfium.wasm"
             })
     void testNonTrackableResources(String path) {
         assertFalse(

app/core/src/main/java/stirling/software/SPDF/config/ExternalAppDepConfig.java

@@ -46,6 +46,7 @@ public class ExternalAppDepConfig {
                         put("qpdf", List.of("qpdf"));
                         put("tesseract", List.of("tesseract"));
                         put("rar", List.of("rar")); // Required for real CBR output
+                        put("magick", List.of("ImageMagick"));
                     }
                 };
     }
@@ -128,6 +129,7 @@ public class ExternalAppDepConfig {
         checkDependencyAndDisableGroup("pdftohtml");
         checkDependencyAndDisableGroup(unoconvPath);
         checkDependencyAndDisableGroup("rar");
+        checkDependencyAndDisableGroup("magick");
         // Special handling for Python/OpenCV dependencies
         boolean pythonAvailable = isCommandAvailable("python3") || isCommandAvailable("python");
         if (!pythonAvailable) {

app/core/src/main/java/stirling/software/SPDF/config/InitialSetup.java

@@ -34,7 +34,6 @@ public class InitialSetup {
     public void init() throws IOException {
         initUUIDKey();
         initSecretKey();
-        initEnableCSRFSecurity();
         initLegalUrls();
         initSetAppVersion();
         GeneralUtils.extractPipeline();
@@ -60,18 +59,6 @@ public class InitialSetup {
         }
     }
 
-    public void initEnableCSRFSecurity() throws IOException {
-        if (GeneralUtils.isVersionHigher(
-                "0.46.0", applicationProperties.getAutomaticallyGenerated().getAppVersion())) {
-            Boolean csrf = applicationProperties.getSecurity().getCsrfDisabled();
-            if (!csrf) {
-                GeneralUtils.saveKeyToSettings("security.csrfDisabled", false);
-                GeneralUtils.saveKeyToSettings("system.enableAnalytics", true);
-                applicationProperties.getSecurity().setCsrfDisabled(false);
-            }
-        }
-    }
-
     public void initLegalUrls() throws IOException {
         // Initialize Terms and Conditions
         String termsUrl = applicationProperties.getLegal().getTermsAndConditions();
@@ -95,7 +82,7 @@ public class InitialSetup {
         isNewServer =
                 existingVersion == null
                         || existingVersion.isEmpty()
-                        || existingVersion.equals("0.0.0");
+                        || "0.0.0".equals(existingVersion);
 
         String appVersion = "0.0.0";
         Resource resource = new ClassPathResource("version.properties");
@@ -107,6 +94,7 @@ public class InitialSetup {
         }
         GeneralUtils.saveKeyToSettings("AutomaticallyGenerated.appVersion", appVersion);
         applicationProperties.getAutomaticallyGenerated().setAppVersion(appVersion);
+        applicationProperties.getAutomaticallyGenerated().setIsNewServer(isNewServer);
     }
 
     public static boolean isNewServer() {

app/core/src/main/java/stirling/software/SPDF/config/OpenApiConfig.java

@@ -62,10 +62,15 @@ public class OpenApiConfig {
 
         // Add server configuration from environment variable
         String swaggerServerUrl = System.getenv("SWAGGER_SERVER_URL");
+        Server server;
         if (swaggerServerUrl != null && !swaggerServerUrl.trim().isEmpty()) {
-            Server server = new Server().url(swaggerServerUrl).description("API Server");
-            openAPI.addServersItem(server);
+            server = new Server().url(swaggerServerUrl).description("API Server");
+        } else {
+            // Use relative path so Swagger uses the current browser origin to avoid CORS issues
+            // when accessing via different ports
+            server = new Server().url("/").description("Current Server");
         }
+        openAPI.addServersItem(server);
 
         // Add ErrorResponse schema to components
         Schema<?> errorResponseSchema =

app/core/src/main/java/stirling/software/SPDF/config/WebMvcConfig.java

@@ -1,10 +1,14 @@
 package stirling.software.SPDF.config;
 
+import java.util.concurrent.TimeUnit;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.http.CacheControl;
 import org.springframework.web.servlet.config.annotation.CorsRegistry;
 import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 import lombok.RequiredArgsConstructor;
@@ -25,6 +29,41 @@ public class WebMvcConfig implements WebMvcConfigurer {
         registry.addInterceptor(endpointInterceptor);
     }
 
+    @Override
+    public void addResourceHandlers(ResourceHandlerRegistry registry) {
+        // Cache hashed assets (JS/CSS with content hashes) for 1 year
+        // These files have names like index-ChAS4tCC.js that change when content changes
+        // Check customFiles/static first, then fall back to classpath
+        registry.addResourceHandler("/assets/**")
+                .addResourceLocations(
+                        "file:"
+                                + stirling.software.common.configuration.InstallationPathConfig
+                                        .getStaticPath()
+                                + "assets/",
+                        "classpath:/static/assets/")
+                .setCacheControl(CacheControl.maxAge(365, TimeUnit.DAYS).cachePublic());
+
+        // Don't cache index.html - it needs to be fresh to reference latest hashed assets
+        // Note: index.html is handled by ReactRoutingController for dynamic processing
+        registry.addResourceHandler("/index.html")
+                .addResourceLocations(
+                        "file:"
+                                + stirling.software.common.configuration.InstallationPathConfig
+                                        .getStaticPath(),
+                        "classpath:/static/")
+                .setCacheControl(CacheControl.noCache().mustRevalidate());
+
+        // Handle all other static resources (js, css, images, fonts, etc.)
+        // Check customFiles/static first for user overrides
+        registry.addResourceHandler("/**")
+                .addResourceLocations(
+                        "file:"
+                                + stirling.software.common.configuration.InstallationPathConfig
+                                        .getStaticPath(),
+                        "classpath:/static/")
+                .setCacheControl(CacheControl.maxAge(1, TimeUnit.HOURS));
+    }
+
     @Override
     public void addCorsMappings(CorsRegistry registry) {
         // Check if running in Tauri mode

app/core/src/main/java/stirling/software/SPDF/controller/api/SettingsController.java

@@ -124,7 +124,6 @@ public class SettingsController {
         ApplicationProperties.Security security = applicationProperties.getSecurity();
 
         settings.put("enableLogin", security.getEnableLogin());
-        settings.put("csrfDisabled", security.getCsrfDisabled());
         settings.put("loginMethod", security.getLoginMethod());
         settings.put("loginAttemptCount", security.getLoginAttemptCount());
         settings.put("loginResetTimeMinutes", security.getLoginResetTimeMinutes());
@@ -159,12 +158,6 @@ public class SettingsController {
                     .getSecurity()
                     .setEnableLogin((Boolean) settings.get("enableLogin"));
         }
-        if (settings.containsKey("csrfDisabled")) {
-            GeneralUtils.saveKeyToSettings("security.csrfDisabled", settings.get("csrfDisabled"));
-            applicationProperties
-                    .getSecurity()
-                    .setCsrfDisabled((Boolean) settings.get("csrfDisabled"));
-        }
         if (settings.containsKey("loginMethod")) {
             GeneralUtils.saveKeyToSettings("security.loginMethod", settings.get("loginMethod"));
             applicationProperties

app/core/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertPdfJsonController.java

@@ -31,12 +31,10 @@ import stirling.software.common.model.api.PDFFile;
 import stirling.software.common.service.JobOwnershipService;
 import stirling.software.common.util.ExceptionUtils;
 import stirling.software.common.util.WebResponseUtils;
-import stirling.software.proprietary.security.config.PremiumEndpoint;
 
 @Slf4j
 @ConvertApi
 @RequiredArgsConstructor
-@PremiumEndpoint
 public class ConvertPdfJsonController {
 
     private final PdfJsonConversionService pdfJsonConversionService;

app/core/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertPdfJsonExceptionHandler.java

@@ -0,0 +1,60 @@
+package stirling.software.SPDF.controller.api.converters;
+
+import java.nio.charset.StandardCharsets;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.SPDF.exception.CacheUnavailableException;
+
+@ControllerAdvice(assignableTypes = ConvertPdfJsonController.class)
+@Slf4j
+@RequiredArgsConstructor
+public class ConvertPdfJsonExceptionHandler {
+
+    private final ObjectMapper objectMapper;
+
+    @ExceptionHandler(CacheUnavailableException.class)
+    @ResponseBody
+    public ResponseEntity<byte[]> handleCacheUnavailable(CacheUnavailableException ex) {
+        try {
+            byte[] body =
+                    objectMapper.writeValueAsBytes(
+                            java.util.Map.of(
+                                    "error", "cache_unavailable",
+                                    "action", "reupload",
+                                    "message", ex.getMessage()));
+            return ResponseEntity.status(HttpStatus.GONE)
+                    .contentType(MediaType.APPLICATION_JSON)
+                    .body(body);
+        } catch (Exception e) {
+            log.warn("Failed to serialize cache_unavailable response", e);
+            var fallbackBody =
+                    java.util.Map.of(
+                            "error", "cache_unavailable",
+                            "action", "reupload",
+                            "message", String.valueOf(ex.getMessage()));
+            try {
+                return ResponseEntity.status(HttpStatus.GONE)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .body(objectMapper.writeValueAsBytes(fallbackBody));
+            } catch (Exception ignored) {
+                // Truly last-ditch fallback
+                return ResponseEntity.status(HttpStatus.GONE)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .body(
+                                "{\"error\":\"cache_unavailable\",\"action\":\"reupload\",\"message\":\"Cache unavailable\"}"
+                                        .getBytes(StandardCharsets.UTF_8));
+            }
+        }
+    }
+}

app/core/src/main/java/stirling/software/SPDF/controller/api/misc/CompressController.java

@@ -28,10 +28,13 @@ import org.apache.pdfbox.pdmodel.PDResources;
 import org.apache.pdfbox.pdmodel.graphics.PDXObject;
 import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject;
 import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.multipart.MultipartFile;
+import org.springframework.web.server.ResponseStatusException;
 
 import io.swagger.v3.oas.annotations.Operation;
 
@@ -44,6 +47,7 @@ import stirling.software.SPDF.model.api.misc.OptimizePdfRequest;
 import stirling.software.common.annotations.AutoJobPostMapping;
 import stirling.software.common.annotations.api.MiscApi;
 import stirling.software.common.service.CustomPDFDocumentFactory;
+import stirling.software.common.service.LineArtConversionService;
 import stirling.software.common.util.ExceptionUtils;
 import stirling.software.common.util.GeneralUtils;
 import stirling.software.common.util.ProcessExecutor;
@@ -58,6 +62,9 @@ public class CompressController {
     private final CustomPDFDocumentFactory pdfDocumentFactory;
     private final EndpointConfiguration endpointConfiguration;
 
+    @Autowired(required = false)
+    private LineArtConversionService lineArtConversionService;
+
     private boolean isQpdfEnabled() {
         return endpointConfiguration.isGroupEnabled("qpdf");
     }
@@ -66,6 +73,10 @@ public class CompressController {
         return endpointConfiguration.isGroupEnabled("Ghostscript");
     }
 
+    private boolean isImageMagickEnabled() {
+        return endpointConfiguration.isGroupEnabled("ImageMagick");
+    }
+
     @Data
     @AllArgsConstructor
     @NoArgsConstructor
@@ -660,6 +671,9 @@ public class CompressController {
         Integer optimizeLevel = request.getOptimizeLevel();
         String expectedOutputSizeString = request.getExpectedOutputSize();
         Boolean convertToGrayscale = request.getGrayscale();
+        Boolean convertToLineArt = request.getLineArt();
+        Double lineArtThreshold = request.getLineArtThreshold();
+        Integer lineArtEdgeLevel = request.getLineArtEdgeLevel();
         if (expectedOutputSizeString == null && optimizeLevel == null) {
             throw new Exception("Both expected output size and optimize level are not specified");
         }
@@ -689,6 +703,26 @@ public class CompressController {
                 optimizeLevel = determineOptimizeLevel(sizeReductionRatio);
             }
 
+            if (Boolean.TRUE.equals(convertToLineArt)) {
+                if (lineArtConversionService == null) {
+                    throw new ResponseStatusException(
+                            HttpStatus.FORBIDDEN,
+                            "Line art conversion is unavailable - ImageMagick service not found");
+                }
+                if (!isImageMagickEnabled()) {
+                    throw new IOException(
+                            "ImageMagick is not enabled but line art conversion was requested");
+                }
+                double thresholdValue =
+                        lineArtThreshold == null
+                                ? 55d
+                                : Math.min(100d, Math.max(0d, lineArtThreshold));
+                int edgeLevel =
+                        lineArtEdgeLevel == null ? 1 : Math.min(3, Math.max(1, lineArtEdgeLevel));
+                currentFile =
+                        applyLineArtConversion(currentFile, tempFiles, thresholdValue, edgeLevel);
+            }
+
             boolean sizeMet = false;
             boolean imageCompressionApplied = false;
             boolean externalCompressionApplied = false;
@@ -810,6 +844,75 @@ public class CompressController {
         }
     }
 
+    private Path applyLineArtConversion(
+            Path currentFile, List<Path> tempFiles, double threshold, int edgeLevel)
+            throws IOException {
+
+        Path lineArtFile = Files.createTempFile("lineart_output_", ".pdf");
+        tempFiles.add(lineArtFile);
+
+        try (PDDocument doc = pdfDocumentFactory.load(currentFile.toFile())) {
+            Map<String, List<ImageReference>> uniqueImages = findImages(doc);
+            CompressionStats stats = new CompressionStats();
+            stats.uniqueImagesCount = uniqueImages.size();
+            calculateImageStats(uniqueImages, stats);
+
+            Map<String, PDImageXObject> convertedImages =
+                    createLineArtImages(doc, uniqueImages, stats, threshold, edgeLevel);
+
+            replaceImages(doc, uniqueImages, convertedImages, stats);
+
+            log.info(
+                    "Applied line art conversion to {} unique images ({} total references)",
+                    stats.uniqueImagesCount,
+                    stats.totalImages);
+
+            doc.save(lineArtFile.toString());
+            return lineArtFile;
+        }
+    }
+
+    private Map<String, PDImageXObject> createLineArtImages(
+            PDDocument doc,
+            Map<String, List<ImageReference>> uniqueImages,
+            CompressionStats stats,
+            double threshold,
+            int edgeLevel)
+            throws IOException {
+
+        Map<String, PDImageXObject> convertedImages = new HashMap<>();
+
+        for (Entry<String, List<ImageReference>> entry : uniqueImages.entrySet()) {
+            String imageHash = entry.getKey();
+            List<ImageReference> references = entry.getValue();
+            if (references.isEmpty()) continue;
+
+            PDImageXObject originalImage = getOriginalImage(doc, references.get(0));
+
+            int originalSize = (int) originalImage.getCOSObject().getLength();
+            stats.totalOriginalBytes += originalSize;
+
+            PDImageXObject converted =
+                    lineArtConversionService.convertImageToLineArt(
+                            doc, originalImage, threshold, edgeLevel);
+            convertedImages.put(imageHash, converted);
+            stats.compressedImages++;
+
+            int convertedSize = (int) converted.getCOSObject().getLength();
+            stats.totalCompressedBytes += convertedSize * references.size();
+
+            double reductionPercentage = 100.0 - ((convertedSize * 100.0) / originalSize);
+            log.info(
+                    "Image hash {}: Line art conversion {} → {} (reduced by {}%)",
+                    imageHash,
+                    GeneralUtils.formatBytes(originalSize),
+                    GeneralUtils.formatBytes(convertedSize),
+                    String.format("%.1f", reductionPercentage));
+        }
+
+        return convertedImages;
+    }
+
     // Run Ghostscript compression
     private void applyGhostscriptCompression(
             OptimizePdfRequest request, int optimizeLevel, Path currentFile, List<Path> tempFiles)

app/core/src/main/java/stirling/software/SPDF/controller/api/misc/ConfigController.java

@@ -74,6 +74,7 @@ public class ConfigController {
             configData.put("appNameNavbar", applicationProperties.getUi().getAppNameNavbar());
             configData.put("languages", applicationProperties.getUi().getLanguages());
             configData.put("logoStyle", applicationProperties.getUi().getLogoStyle());
+            configData.put("defaultLocale", applicationProperties.getSystem().getDefaultLocale());
 
             // Security settings
             // enableLogin requires both the config flag AND proprietary features to be loaded
@@ -123,6 +124,9 @@ public class ConfigController {
                     "enableAnalytics", applicationProperties.getSystem().getEnableAnalytics());
             configData.put("enablePosthog", applicationProperties.getSystem().getEnablePosthog());
             configData.put("enableScarf", applicationProperties.getSystem().getEnableScarf());
+            configData.put(
+                    "enableDesktopInstallSlide",
+                    applicationProperties.getSystem().getEnableDesktopInstallSlide());
 
             // Premium/Enterprise settings
             configData.put("premiumEnabled", applicationProperties.getPremium().isEnabled());
@@ -226,4 +230,10 @@ public class ConfigController {
         }
         return ResponseEntity.ok(result);
     }
+
+    @GetMapping("/group-enabled")
+    public ResponseEntity<Boolean> isGroupEnabled(@RequestParam(name = "group") String group) {
+        boolean enabled = endpointConfiguration.isGroupEnabled(group);
+        return ResponseEntity.ok(enabled);
+    }
 }

app/core/src/main/java/stirling/software/SPDF/controller/api/security/CertSignController.java

@@ -191,6 +191,12 @@ public class CertSignController {
 
         switch (certType) {
             case "PEM":
+                privateKeyFile =
+                        validateFilePresent(
+                                privateKeyFile, "PEM private key", "private key file is required");
+                certFile =
+                        validateFilePresent(
+                                certFile, "PEM certificate", "certificate file is required");
                 ks = KeyStore.getInstance("JKS");
                 ks.load(null);
                 PrivateKey privateKey = getPrivateKeyFromPEM(privateKeyFile.getBytes(), password);
@@ -200,10 +206,16 @@ public class CertSignController {
                 break;
             case "PKCS12":
             case "PFX":
+                p12File =
+                        validateFilePresent(
+                                p12File, "PKCS12 keystore", "PKCS12/PFX keystore file is required");
                 ks = KeyStore.getInstance("PKCS12");
                 ks.load(p12File.getInputStream(), password.toCharArray());
                 break;
             case "JKS":
+                jksfile =
+                        validateFilePresent(
+                                jksfile, "JKS keystore", "JKS keystore file is required");
                 ks = KeyStore.getInstance("JKS");
                 ks.load(jksfile.getInputStream(), password.toCharArray());
                 break;
@@ -251,6 +263,17 @@ public class CertSignController {
                 GeneralUtils.generateFilename(pdf.getOriginalFilename(), "_signed.pdf"));
     }
 
+    private MultipartFile validateFilePresent(
+            MultipartFile file, String argumentName, String errorDescription) {
+        if (file == null || file.isEmpty()) {
+            throw ExceptionUtils.createIllegalArgumentException(
+                    "error.invalidArgument",
+                    "Invalid argument: {0}",
+                    argumentName + " - " + errorDescription);
+        }
+        return file;
+    }
+
     private PrivateKey getPrivateKeyFromPEM(byte[] pemBytes, String password)
             throws IOException, OperatorCreationException, PKCSException {
         try (PEMParser pemParser =

app/core/src/main/java/stirling/software/SPDF/controller/web/ReactRoutingController.java

@@ -3,18 +3,27 @@ package stirling.software.SPDF.controller.web;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
-
-import jakarta.annotation.PostConstruct;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.core.io.Resource;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 
+import jakarta.annotation.PostConstruct;
 import jakarta.servlet.http.HttpServletRequest;
 
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.common.configuration.InstallationPathConfig;
+
+@Slf4j
 @Controller
 public class ReactRoutingController {
 
@@ -23,24 +32,44 @@ public class ReactRoutingController {
 
     private String cachedIndexHtml;
     private boolean indexHtmlExists = false;
+    private boolean useExternalIndexHtml = false;
 
     @PostConstruct
     public void init() {
-        // Only cache if index.html exists (production builds)
+        log.info("Static files custom path: {}", InstallationPathConfig.getStaticPath());
+
+        // Check for external index.html first (customFiles/static/)
+        Path externalIndexPath = Paths.get(InstallationPathConfig.getStaticPath(), "index.html");
+        log.debug("Checking for custom index.html at: {}", externalIndexPath);
+        if (Files.exists(externalIndexPath) && Files.isReadable(externalIndexPath)) {
+            log.info("Using custom index.html from: {}", externalIndexPath);
+            try {
+                this.cachedIndexHtml = processIndexHtml();
+                this.indexHtmlExists = true;
+                this.useExternalIndexHtml = true;
+                return;
+            } catch (IOException e) {
+                log.warn("Failed to load custom index.html, falling back to classpath", e);
+            }
+        }
+
+        // Fall back to classpath index.html
         ClassPathResource resource = new ClassPathResource("static/index.html");
         if (resource.exists()) {
             try {
                 this.cachedIndexHtml = processIndexHtml();
                 this.indexHtmlExists = true;
+                this.useExternalIndexHtml = false;
             } catch (IOException e) {
                 // Failed to cache, will process on each request
+                log.warn("Failed to cache index.html", e);
                 this.indexHtmlExists = false;
             }
         }
     }
 
     private String processIndexHtml() throws IOException {
-        ClassPathResource resource = new ClassPathResource("static/index.html");
+        Resource resource = getIndexHtmlResource();
 
         try (InputStream inputStream = resource.getInputStream()) {
             String html = new String(inputStream.readAllBytes(), StandardCharsets.UTF_8);
@@ -63,9 +92,21 @@ public class ReactRoutingController {
         }
     }
 
-    @GetMapping(value = {"/", "/index.html"}, produces = MediaType.TEXT_HTML_VALUE)
-    public ResponseEntity<String> serveIndexHtml(HttpServletRequest request)
-            throws IOException {
+    private Resource getIndexHtmlResource() throws IOException {
+        // Check external location first
+        Path externalIndexPath = Paths.get(InstallationPathConfig.getStaticPath(), "index.html");
+        if (Files.exists(externalIndexPath) && Files.isReadable(externalIndexPath)) {
+            return new FileSystemResource(externalIndexPath.toFile());
+        }
+
+        // Fall back to classpath
+        return new ClassPathResource("static/index.html");
+    }
+
+    @GetMapping(
+            value = {"/", "/index.html"},
+            produces = MediaType.TEXT_HTML_VALUE)
+    public ResponseEntity<String> serveIndexHtml(HttpServletRequest request) throws IOException {
         if (indexHtmlExists && cachedIndexHtml != null) {
             return ResponseEntity.ok().contentType(MediaType.TEXT_HTML).body(cachedIndexHtml);
         }
@@ -74,14 +115,13 @@ public class ReactRoutingController {
     }
 
     @GetMapping(
-            "/{path:^(?!api|static|robots\\.txt|favicon\\.ico|manifest.*\\.json|pipeline|pdfjs|pdfjs-legacy|fonts|images|files|css|js|assets|locales|modern-logo|classic-logo|Login|og_images|samples)[^\\.]*$}")
-    public ResponseEntity<String> forwardRootPaths(HttpServletRequest request)
-            throws IOException {
+            "/{path:^(?!api|static|robots\\.txt|favicon\\.ico|manifest.*\\.json|pipeline|pdfjs|pdfjs-legacy|pdfium|fonts|images|files|css|js|assets|locales|modern-logo|classic-logo|Login|og_images|samples)[^\\.]*$}")
+    public ResponseEntity<String> forwardRootPaths(HttpServletRequest request) throws IOException {
         return serveIndexHtml(request);
     }
 
     @GetMapping(
-            "/{path:^(?!api|static|pipeline|pdfjs|pdfjs-legacy|fonts|images|files|css|js|assets|locales|modern-logo|classic-logo|Login|og_images|samples)[^\\.]*}/{subpath:^(?!.*\\.).*$}")
+            "/{path:^(?!api|static|pipeline|pdfjs|pdfjs-legacy|pdfium|fonts|images|files|css|js|assets|locales|modern-logo|classic-logo|Login|og_images|samples)[^\\.]*}/{subpath:^(?!.*\\.).*$}")
     public ResponseEntity<String> forwardNestedPaths(HttpServletRequest request)
             throws IOException {
         return serveIndexHtml(request);

app/core/src/main/java/stirling/software/SPDF/exception/CacheUnavailableException.java

@@ -0,0 +1,8 @@
+package stirling.software.SPDF.exception;
+
+public class CacheUnavailableException extends RuntimeException {
+
+    public CacheUnavailableException(String message) {
+        super(message);
+    }
+}

app/core/src/main/java/stirling/software/SPDF/model/api/misc/OptimizePdfRequest.java

@@ -45,4 +45,26 @@ public class OptimizePdfRequest extends PDFFile {
             requiredMode = Schema.RequiredMode.REQUIRED,
             defaultValue = "false")
     private Boolean grayscale = false;
+
+    @Schema(
+            description =
+                    "Whether to convert images to high-contrast line art using ImageMagick. Default is false.",
+            requiredMode = Schema.RequiredMode.NOT_REQUIRED,
+            defaultValue = "false")
+    private Boolean lineArt = false;
+
+    @Schema(
+            description = "Threshold to use for line art conversion (0-100).",
+            requiredMode = Schema.RequiredMode.NOT_REQUIRED,
+            defaultValue = "55")
+    private Double lineArtThreshold = 55d;
+
+    @Schema(
+            description =
+                    "Edge detection strength to use for line art conversion (1-3). This maps to"
+                            + " ImageMagick's -edge radius.",
+            requiredMode = Schema.RequiredMode.NOT_REQUIRED,
+            defaultValue = "1",
+            allowableValues = {"1", "2", "3"})
+    private Integer lineArtEdgeLevel = 1;
 }

app/core/src/main/java/stirling/software/SPDF/service/PdfJsonConversionService.java

@@ -86,7 +86,6 @@ import org.apache.pdfbox.text.PDFTextStripper;
 import org.apache.pdfbox.text.TextPosition;
 import org.apache.pdfbox.util.DateConverter;
 import org.apache.pdfbox.util.Matrix;
-import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 import org.springframework.web.multipart.MultipartFile;
 
@@ -144,15 +143,23 @@ public class PdfJsonConversionService {
     private final PdfJsonFontService fontService;
     private final Type3FontConversionService type3FontConversionService;
     private final Type3GlyphExtractor type3GlyphExtractor;
+    private final stirling.software.common.model.ApplicationProperties applicationProperties;
     private final Map<String, PDFont> type3NormalizedFontCache = new ConcurrentHashMap<>();
     private final Map<String, Set<Integer>> type3GlyphCoverageCache = new ConcurrentHashMap<>();
 
-    @Value("${stirling.pdf.json.font-normalization.enabled:true}")
     private boolean fontNormalizationEnabled;
+    private long cacheMaxBytes;
+    private int cacheMaxPercent;
 
     /** Cache for storing PDDocuments for lazy page loading. Key is jobId. */
     private final Map<String, CachedPdfDocument> documentCache = new ConcurrentHashMap<>();
 
+    private final java.util.LinkedHashMap<String, CachedPdfDocument> lruCache =
+            new java.util.LinkedHashMap<>(16, 0.75f, true);
+    private final Object cacheLock = new Object();
+    private volatile long currentCacheBytes = 0L;
+    private volatile long cacheBudgetBytes = -1L;
+
     private volatile boolean ghostscriptAvailable;
 
     private static final float FLOAT_EPSILON = 0.0001f;
@@ -161,7 +168,23 @@ public class PdfJsonConversionService {
 
     @PostConstruct
     private void initializeToolAvailability() {
+        loadConfigurationFromProperties();
         initializeGhostscriptAvailability();
+        initializeCacheBudget();
+    }
+
+    private void loadConfigurationFromProperties() {
+        stirling.software.common.model.ApplicationProperties.PdfEditor cfg =
+                applicationProperties.getPdfEditor();
+        if (cfg != null) {
+            fontNormalizationEnabled = cfg.getFontNormalization().isEnabled();
+            cacheMaxBytes = cfg.getCache().getMaxBytes();
+            cacheMaxPercent = cfg.getCache().getMaxPercent();
+        } else {
+            fontNormalizationEnabled = false;
+            cacheMaxBytes = -1;
+            cacheMaxPercent = 20;
+        }
     }
 
     private void initializeGhostscriptAvailability() {
@@ -202,6 +225,25 @@ public class PdfJsonConversionService {
         }
     }
 
+    private void initializeCacheBudget() {
+        long effective = -1L;
+        if (cacheMaxBytes > 0) {
+            effective = cacheMaxBytes;
+        } else if (cacheMaxPercent > 0) {
+            long maxMem = Runtime.getRuntime().maxMemory();
+            effective = Math.max(0L, (maxMem * cacheMaxPercent) / 100);
+        }
+        cacheBudgetBytes = effective;
+        if (cacheBudgetBytes > 0) {
+            log.info(
+                    "PDF JSON cache budget configured: {} bytes (source: {})",
+                    cacheBudgetBytes,
+                    cacheMaxBytes > 0 ? "max-bytes" : "max-percent");
+        } else {
+            log.info("PDF JSON cache budget: unlimited");
+        }
+    }
+
     public byte[] convertPdfToJson(MultipartFile file) throws IOException {
         return convertPdfToJson(file, null, false);
     }
@@ -236,7 +278,10 @@ public class PdfJsonConversionService {
             log.debug("Generated synthetic jobId for synchronous conversion: {}", jobId);
         } else {
             jobId = contextJobId;
-            log.debug("Starting PDF to JSON conversion, jobId from context: {}", jobId);
+            log.info(
+                    "Starting PDF to JSON conversion, jobId from context: {} (lightweight={})",
+                    jobId,
+                    lightweight);
         }
 
         Consumer<PdfJsonConversionProgress> progress =
@@ -318,9 +363,9 @@ public class PdfJsonConversionService {
 
             try (PDDocument document = pdfDocumentFactory.load(workingPath, true)) {
                 int totalPages = document.getNumberOfPages();
-                // Only use lazy images for real async jobs where client can access the cache
-                // Synchronous calls with synthetic jobId should do full extraction
-                boolean useLazyImages = totalPages > 5 && isRealJobId;
+                // Always enable lazy mode for real async jobs so cache is available regardless of
+                // page count. Synchronous calls with synthetic jobId still do full extraction.
+                boolean useLazyImages = isRealJobId;
                 Map<COSBase, FontModelCacheEntry> fontCache = new IdentityHashMap<>();
                 Map<COSBase, EncodedImage> imageCache = new IdentityHashMap<>();
                 log.debug(
@@ -403,6 +448,11 @@ public class PdfJsonConversionService {
 
                 // Only cache for real async jobIds, not synthetic synchronous ones
                 if (useLazyImages && isRealJobId) {
+                    log.info(
+                            "Creating cache for jobId: {} (useLazyImages={}, isRealJobId={})",
+                            jobId,
+                            useLazyImages,
+                            isRealJobId);
                     PdfJsonDocumentMetadata docMetadata = new PdfJsonDocumentMetadata();
                     docMetadata.setMetadata(pdfJson.getMetadata());
                     docMetadata.setXmpMetadata(pdfJson.getXmpMetadata());
@@ -435,16 +485,23 @@ public class PdfJsonConversionService {
                         cachedPdfBytes = Files.readAllBytes(workingPath);
                     }
                     CachedPdfDocument cached =
-                            new CachedPdfDocument(
-                                    cachedPdfBytes, docMetadata, fonts, pageFontResources);
-                    documentCache.put(jobId, cached);
-                    log.debug(
-                            "Cached PDF bytes ({} bytes, {} pages, {} fonts) for lazy images, jobId: {}",
-                            cachedPdfBytes.length,
+                            buildCachedDocument(
+                                    jobId, cachedPdfBytes, docMetadata, fonts, pageFontResources);
+                    putCachedDocument(jobId, cached);
+                    log.info(
+                            "Successfully cached PDF ({} bytes, {} pages, {} fonts) for jobId: {} (diskBacked={})",
+                            cached.getPdfSize(),
                             totalPages,
                             fonts.size(),
-                            jobId);
+                            jobId,
+                            cached.isDiskBacked());
                     scheduleDocumentCleanup(jobId);
+                } else {
+                    log.warn(
+                            "Skipping cache creation: useLazyImages={}, isRealJobId={}, jobId={}",
+                            useLazyImages,
+                            isRealJobId,
+                            jobId);
                 }
 
                 if (lightweight) {
@@ -2973,6 +3030,139 @@ public class PdfJsonConversionService {
         }
     }
 
+    // Cache helpers
+    private CachedPdfDocument buildCachedDocument(
+            String jobId,
+            byte[] pdfBytes,
+            PdfJsonDocumentMetadata metadata,
+            Map<String, PdfJsonFont> fonts,
+            Map<Integer, Map<PDFont, String>> pageFontResources)
+            throws IOException {
+        if (pdfBytes == null) {
+            throw new IllegalArgumentException("pdfBytes must not be null");
+        }
+        long budget = cacheBudgetBytes;
+        // If single document is larger than budget, spill straight to disk
+        if (budget > 0 && pdfBytes.length > budget) {
+            TempFile tempFile = new TempFile(tempFileManager, ".pdfjsoncache");
+            Files.write(tempFile.getPath(), pdfBytes);
+            log.debug(
+                    "Cached PDF spilled to disk ({} bytes exceeds budget {}) for jobId {}",
+                    pdfBytes.length,
+                    budget,
+                    jobId);
+            return new CachedPdfDocument(
+                    null, tempFile, pdfBytes.length, metadata, fonts, pageFontResources);
+        }
+        return new CachedPdfDocument(
+                pdfBytes, null, pdfBytes.length, metadata, fonts, pageFontResources);
+    }
+
+    private void putCachedDocument(String jobId, CachedPdfDocument cached) {
+        synchronized (cacheLock) {
+            CachedPdfDocument existing = documentCache.put(jobId, cached);
+            if (existing != null) {
+                lruCache.remove(jobId);
+                currentCacheBytes = Math.max(0L, currentCacheBytes - existing.getInMemorySize());
+                existing.close();
+            }
+            lruCache.put(jobId, cached);
+            currentCacheBytes += cached.getInMemorySize();
+            enforceCacheBudget();
+        }
+    }
+
+    private CachedPdfDocument getCachedDocument(String jobId) {
+        synchronized (cacheLock) {
+            CachedPdfDocument cached = documentCache.get(jobId);
+            if (cached != null) {
+                lruCache.remove(jobId);
+                lruCache.put(jobId, cached);
+            }
+            return cached;
+        }
+    }
+
+    private void enforceCacheBudget() {
+        if (cacheBudgetBytes <= 0) {
+            return;
+        }
+        // Must be called under cacheLock
+        java.util.Iterator<java.util.Map.Entry<String, CachedPdfDocument>> it =
+                lruCache.entrySet().iterator();
+        while (currentCacheBytes > cacheBudgetBytes && it.hasNext()) {
+            java.util.Map.Entry<String, CachedPdfDocument> entry = it.next();
+            it.remove();
+            CachedPdfDocument removed = entry.getValue();
+            documentCache.remove(entry.getKey(), removed);
+            currentCacheBytes = Math.max(0L, currentCacheBytes - removed.getInMemorySize());
+            removed.close();
+            log.warn(
+                    "Evicted cached PDF for jobId {} to enforce cache budget (budget={} bytes, current={} bytes)",
+                    entry.getKey(),
+                    cacheBudgetBytes,
+                    currentCacheBytes);
+        }
+        if (currentCacheBytes > cacheBudgetBytes && !lruCache.isEmpty()) {
+            // Spill the most recently used large entry to disk
+            String key =
+                    lruCache.entrySet().stream()
+                            .reduce((first, second) -> second)
+                            .map(java.util.Map.Entry::getKey)
+                            .orElse(null);
+            if (key != null) {
+                CachedPdfDocument doc = lruCache.get(key);
+                if (doc != null && doc.getInMemorySize() > 0) {
+                    try {
+                        CachedPdfDocument diskDoc =
+                                buildCachedDocument(
+                                        key,
+                                        doc.getPdfBytes(),
+                                        doc.getMetadata(),
+                                        doc.getFonts(),
+                                        doc.getPageFontResources());
+                        lruCache.put(key, diskDoc);
+                        documentCache.put(key, diskDoc);
+                        currentCacheBytes =
+                                Math.max(0L, currentCacheBytes - doc.getInMemorySize())
+                                        + diskDoc.getInMemorySize();
+                        doc.close();
+                        log.debug("Spilled cached PDF for jobId {} to disk to satisfy budget", key);
+                    } catch (IOException ex) {
+                        log.warn(
+                                "Failed to spill cached PDF for jobId {} to disk: {}",
+                                key,
+                                ex.getMessage());
+                    }
+                }
+            }
+        }
+    }
+
+    private void removeCachedDocument(String jobId) {
+        log.warn(
+                "removeCachedDocument called for jobId: {} [CALLER: {}]",
+                jobId,
+                Thread.currentThread().getStackTrace()[2].toString());
+        CachedPdfDocument removed = null;
+        synchronized (cacheLock) {
+            removed = documentCache.remove(jobId);
+            if (removed != null) {
+                lruCache.remove(jobId);
+                currentCacheBytes = Math.max(0L, currentCacheBytes - removed.getInMemorySize());
+                log.warn(
+                        "Removed cached document for jobId: {} (size={} bytes)",
+                        jobId,
+                        removed.getInMemorySize());
+            } else {
+                log.warn("Attempted to remove jobId: {} but it was not in cache", jobId);
+            }
+        }
+        if (removed != null) {
+            removed.close();
+        }
+    }
+
     private void applyTextState(PDPageContentStream contentStream, PdfJsonTextElement element)
             throws IOException {
         if (element.getCharacterSpacing() != null) {
@@ -5311,6 +5501,8 @@ public class PdfJsonConversionService {
      */
     private static class CachedPdfDocument {
         private final byte[] pdfBytes;
+        private final TempFile pdfTempFile;
+        private final long pdfSize;
         private final PdfJsonDocumentMetadata metadata;
         private final Map<String, PdfJsonFont> fonts; // Font map with UIDs for consistency
         private final Map<Integer, Map<PDFont, String>> pageFontResources; // Page font resources
@@ -5318,10 +5510,14 @@ public class PdfJsonConversionService {
 
         public CachedPdfDocument(
                 byte[] pdfBytes,
+                TempFile pdfTempFile,
+                long pdfSize,
                 PdfJsonDocumentMetadata metadata,
                 Map<String, PdfJsonFont> fonts,
                 Map<Integer, Map<PDFont, String>> pageFontResources) {
             this.pdfBytes = pdfBytes;
+            this.pdfTempFile = pdfTempFile;
+            this.pdfSize = pdfSize;
             this.metadata = metadata;
             // Create defensive copies to prevent mutation of shared maps
             this.fonts =
@@ -5336,8 +5532,14 @@ public class PdfJsonConversionService {
         }
 
         // Getters return defensive copies to prevent external mutation
-        public byte[] getPdfBytes() {
-            return pdfBytes;
+        public byte[] getPdfBytes() throws IOException {
+            if (pdfBytes != null) {
+                return pdfBytes;
+            }
+            if (pdfTempFile != null) {
+                return Files.readAllBytes(pdfTempFile.getPath());
+            }
+            throw new IOException("Cached PDF backing missing");
         }
 
         public PdfJsonDocumentMetadata getMetadata() {
@@ -5352,6 +5554,18 @@ public class PdfJsonConversionService {
             return new java.util.concurrent.ConcurrentHashMap<>(pageFontResources);
         }
 
+        public long getPdfSize() {
+            return pdfSize;
+        }
+
+        public long getInMemorySize() {
+            return pdfBytes != null ? pdfBytes.length : 0L;
+        }
+
+        public boolean isDiskBacked() {
+            return pdfBytes == null && pdfTempFile != null;
+        }
+
         public long getTimestamp() {
             return timestamp;
         }
@@ -5363,7 +5577,19 @@ public class PdfJsonConversionService {
         public CachedPdfDocument withUpdatedFonts(
                 byte[] nextBytes, Map<String, PdfJsonFont> nextFonts) {
             Map<String, PdfJsonFont> fontsToUse = nextFonts != null ? nextFonts : this.fonts;
-            return new CachedPdfDocument(nextBytes, metadata, fontsToUse, pageFontResources);
+            return new CachedPdfDocument(
+                    nextBytes,
+                    null,
+                    nextBytes != null ? nextBytes.length : 0,
+                    metadata,
+                    fontsToUse,
+                    pageFontResources);
+        }
+
+        public void close() {
+            if (pdfTempFile != null) {
+                pdfTempFile.close();
+            }
         }
     }
 
@@ -5444,14 +5670,15 @@ public class PdfJsonConversionService {
             // Cache PDF bytes, metadata, and fonts for lazy page loading
             if (jobId != null) {
                 CachedPdfDocument cached =
-                        new CachedPdfDocument(pdfBytes, docMetadata, fonts, pageFontResources);
-                documentCache.put(jobId, cached);
+                        buildCachedDocument(jobId, pdfBytes, docMetadata, fonts, pageFontResources);
+                putCachedDocument(jobId, cached);
                 log.debug(
-                        "Cached PDF bytes ({} bytes, {} pages, {} fonts) for lazy loading, jobId: {}",
-                        pdfBytes.length,
+                        "Cached PDF bytes ({} bytes, {} pages, {} fonts) for lazy loading, jobId: {} (diskBacked={})",
+                        cached.getPdfSize(),
                         totalPages,
                         fonts.size(),
-                        jobId);
+                        jobId,
+                        cached.isDiskBacked());
 
                 // Schedule cleanup after 30 minutes
                 scheduleDocumentCleanup(jobId);
@@ -5466,9 +5693,10 @@ public class PdfJsonConversionService {
 
     /** Extracts a single page from cached PDF bytes. Re-loads the PDF for each request. */
     public byte[] extractSinglePage(String jobId, int pageNumber) throws IOException {
-        CachedPdfDocument cached = documentCache.get(jobId);
+        CachedPdfDocument cached = getCachedDocument(jobId);
         if (cached == null) {
-            throw new IllegalArgumentException("No cached document found for jobId: " + jobId);
+            throw new stirling.software.SPDF.exception.CacheUnavailableException(
+                    "No cached document found for jobId: " + jobId);
         }
 
         int pageIndex = pageNumber - 1;
@@ -5480,8 +5708,8 @@ public class PdfJsonConversionService {
         }
 
         log.debug(
-                "Loading PDF from bytes ({} bytes) to extract page {} (jobId: {})",
-                cached.getPdfBytes().length,
+                "Loading PDF from {} to extract page {} (jobId: {})",
+                cached.isDiskBacked() ? "disk cache" : "memory cache",
                 pageNumber,
                 jobId);
 
@@ -5627,10 +5855,21 @@ public class PdfJsonConversionService {
         if (jobId == null || jobId.isBlank()) {
             throw new IllegalArgumentException("jobId is required for incremental export");
         }
-        CachedPdfDocument cached = documentCache.get(jobId);
+        log.info("Looking up cache for jobId: {}", jobId);
+        CachedPdfDocument cached = getCachedDocument(jobId);
         if (cached == null) {
-            throw new IllegalArgumentException("No cached document available for jobId: " + jobId);
+            log.error(
+                    "Cache not found for jobId: {}. Available cache keys: {}",
+                    jobId,
+                    documentCache.keySet());
+            throw new stirling.software.SPDF.exception.CacheUnavailableException(
+                    "No cached document available for jobId: " + jobId);
         }
+        log.info(
+                "Found cached document for jobId: {} (size={}, diskBacked={})",
+                jobId,
+                cached.getPdfSize(),
+                cached.isDiskBacked());
         if (updates == null || updates.getPages() == null || updates.getPages().isEmpty()) {
             log.debug(
                     "Incremental export requested with no page updates; returning cached PDF for jobId {}",
@@ -5709,7 +5948,14 @@ public class PdfJsonConversionService {
             document.save(baos);
             byte[] updatedBytes = baos.toByteArray();
 
-            documentCache.put(jobId, cached.withUpdatedFonts(updatedBytes, mergedFonts));
+            CachedPdfDocument updated =
+                    buildCachedDocument(
+                            jobId,
+                            updatedBytes,
+                            cached.getMetadata(),
+                            mergedFonts,
+                            cached.getPageFontResources());
+            putCachedDocument(jobId, updated);
 
             // Clear Type3 cache entries for this incremental update
             clearType3CacheEntriesForJob(updateJobId);
@@ -5724,11 +5970,13 @@ public class PdfJsonConversionService {
 
     /** Clears a cached document. */
     public void clearCachedDocument(String jobId) {
-        CachedPdfDocument cached = documentCache.remove(jobId);
+        CachedPdfDocument cached = getCachedDocument(jobId);
+        removeCachedDocument(jobId);
         if (cached != null) {
             log.debug(
-                    "Removed cached PDF bytes ({} bytes) for jobId: {}",
-                    cached.getPdfBytes().length,
+                    "Removed cached PDF ({} bytes, diskBacked={}) for jobId: {}",
+                    cached.getPdfSize(),
+                    cached.isDiskBacked(),
                     jobId);
         }
 

app/core/src/main/java/stirling/software/SPDF/service/PdfJsonFallbackFontService.java

@@ -33,8 +33,12 @@ public class PdfJsonFallbackFontService {
     public static final String FALLBACK_FONT_CJK_ID = "fallback-noto-cjk";
     public static final String FALLBACK_FONT_JP_ID = "fallback-noto-jp";
     public static final String FALLBACK_FONT_KR_ID = "fallback-noto-korean";
+    public static final String FALLBACK_FONT_TC_ID = "fallback-noto-tc";
     public static final String FALLBACK_FONT_AR_ID = "fallback-noto-arabic";
     public static final String FALLBACK_FONT_TH_ID = "fallback-noto-thai";
+    public static final String FALLBACK_FONT_DEVANAGARI_ID = "fallback-noto-devanagari";
+    public static final String FALLBACK_FONT_MALAYALAM_ID = "fallback-noto-malayalam";
+    public static final String FALLBACK_FONT_TIBETAN_ID = "fallback-noto-tibetan";
 
     // Font name aliases map PDF font names to available fallback fonts
     // This provides better visual consistency when editing PDFs
@@ -59,6 +63,22 @@ public class PdfJsonFallbackFontService {
                     Map.entry("dejavuserif", "fallback-dejavu-serif"),
                     Map.entry("dejavumono", "fallback-dejavu-mono"),
                     Map.entry("dejavusansmono", "fallback-dejavu-mono"),
+                    // Traditional Chinese fonts (Taiwan, Hong Kong, Macau)
+                    Map.entry("mingliu", "fallback-noto-tc"),
+                    Map.entry("pmingliu", "fallback-noto-tc"),
+                    Map.entry("microsoftjhenghei", "fallback-noto-tc"),
+                    Map.entry("jhenghei", "fallback-noto-tc"),
+                    Map.entry("kaiti", "fallback-noto-tc"),
+                    Map.entry("kaiu", "fallback-noto-tc"),
+                    Map.entry("dfkaib5", "fallback-noto-tc"),
+                    Map.entry("dfkai", "fallback-noto-tc"),
+                    // Simplified Chinese fonts (Mainland China) - more common
+                    Map.entry("simsun", "fallback-noto-cjk"),
+                    Map.entry("simhei", "fallback-noto-cjk"),
+                    Map.entry("microsoftyahei", "fallback-noto-cjk"),
+                    Map.entry("yahei", "fallback-noto-cjk"),
+                    Map.entry("songti", "fallback-noto-cjk"),
+                    Map.entry("heiti", "fallback-noto-cjk"),
                     // Noto Sans - Google's universal font (use as last resort generic fallback)
                     Map.entry("noto", "fallback-noto-sans"),
                     Map.entry("notosans", "fallback-noto-sans"));
@@ -83,6 +103,12 @@ public class PdfJsonFallbackFontService {
                                     "classpath:/static/fonts/NotoSansKR-Regular.ttf",
                                     "NotoSansKR-Regular",
                                     "ttf")),
+                    Map.entry(
+                            FALLBACK_FONT_TC_ID,
+                            new FallbackFontSpec(
+                                    "classpath:/static/fonts/NotoSansTC-Regular.ttf",
+                                    "NotoSansTC-Regular",
+                                    "ttf")),
                     Map.entry(
                             FALLBACK_FONT_AR_ID,
                             new FallbackFontSpec(
@@ -95,6 +121,24 @@ public class PdfJsonFallbackFontService {
                                     "classpath:/static/fonts/NotoSansThai-Regular.ttf",
                                     "NotoSansThai-Regular",
                                     "ttf")),
+                    Map.entry(
+                            FALLBACK_FONT_DEVANAGARI_ID,
+                            new FallbackFontSpec(
+                                    "classpath:/static/fonts/NotoSansDevanagari-Regular.ttf",
+                                    "NotoSansDevanagari-Regular",
+                                    "ttf")),
+                    Map.entry(
+                            FALLBACK_FONT_MALAYALAM_ID,
+                            new FallbackFontSpec(
+                                    "classpath:/static/fonts/NotoSansMalayalam-Regular.ttf",
+                                    "NotoSansMalayalam-Regular",
+                                    "ttf")),
+                    Map.entry(
+                            FALLBACK_FONT_TIBETAN_ID,
+                            new FallbackFontSpec(
+                                    "classpath:/static/fonts/NotoSerifTibetan-Regular.ttf",
+                                    "NotoSerifTibetan-Regular",
+                                    "ttf")),
                     // Liberation Sans family
                     Map.entry(
                             "fallback-liberation-sans",
@@ -268,12 +312,29 @@ public class PdfJsonFallbackFontService {
                                     "ttf")));
 
     private final ResourceLoader resourceLoader;
+    private final stirling.software.common.model.ApplicationProperties applicationProperties;
 
     @Value("${stirling.pdf.fallback-font:" + DEFAULT_FALLBACK_FONT_LOCATION + "}")
+    private String legacyFallbackFontLocation;
+
     private String fallbackFontLocation;
 
     private final Map<String, byte[]> fallbackFontCache = new ConcurrentHashMap<>();
 
+    @jakarta.annotation.PostConstruct
+    private void loadConfig() {
+        String configured = null;
+        if (applicationProperties.getPdfEditor() != null) {
+            configured = applicationProperties.getPdfEditor().getFallbackFont();
+        }
+        if (configured != null && !configured.isBlank()) {
+            fallbackFontLocation = configured;
+        } else {
+            fallbackFontLocation = legacyFallbackFontLocation;
+        }
+        log.info("Using fallback font location: {}", fallbackFontLocation);
+    }
+
     public PdfJsonFont buildFallbackFontModel() throws IOException {
         return buildFallbackFontModel(FALLBACK_FONT_ID);
     }
@@ -484,6 +545,20 @@ public class PdfJsonFallbackFontService {
      */
     public String resolveFallbackFontId(int codePoint) {
         Character.UnicodeBlock block = Character.UnicodeBlock.of(codePoint);
+
+        // Bopomofo is primarily used in Taiwan for Traditional Chinese phonetic annotation
+        if (block == Character.UnicodeBlock.BOPOMOFO
+                || block == Character.UnicodeBlock.BOPOMOFO_EXTENDED) {
+            return FALLBACK_FONT_TC_ID;
+        }
+
+        // Compatibility ideographs are primarily used by Traditional Chinese encodings (e.g., Big5,
+        // HKSCS) so prefer the Traditional Chinese fallback here.
+        if (block == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
+                || block == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT) {
+            return FALLBACK_FONT_TC_ID;
+        }
+
         if (block == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
                 || block == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
                 || block == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
@@ -492,19 +567,23 @@ public class PdfJsonFallbackFontService {
                 || block == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_E
                 || block == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_F
                 || block == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
-                || block == Character.UnicodeBlock.BOPOMOFO
-                || block == Character.UnicodeBlock.BOPOMOFO_EXTENDED
                 || block == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
             return FALLBACK_FONT_CJK_ID;
         }
 
         Character.UnicodeScript script = Character.UnicodeScript.of(codePoint);
         return switch (script) {
+            // HAN script is used by both Simplified and Traditional Chinese
+            // Default to Simplified (mainland China, 1.4B speakers) as it's more common
+            // Traditional Chinese PDFs are detected via font name aliases (MingLiU, PMingLiU, etc.)
             case HAN -> FALLBACK_FONT_CJK_ID;
             case HIRAGANA, KATAKANA -> FALLBACK_FONT_JP_ID;
             case HANGUL -> FALLBACK_FONT_KR_ID;
             case ARABIC -> FALLBACK_FONT_AR_ID;
             case THAI -> FALLBACK_FONT_TH_ID;
+            case DEVANAGARI -> FALLBACK_FONT_DEVANAGARI_ID;
+            case MALAYALAM -> FALLBACK_FONT_MALAYALAM_ID;
+            case TIBETAN -> FALLBACK_FONT_TIBETAN_ID;
             default -> FALLBACK_FONT_ID;
         };
     }

app/core/src/main/java/stirling/software/SPDF/service/pdfjson/PdfJsonFontService.java

@@ -5,7 +5,6 @@ import java.nio.file.Files;
 import java.util.Base64;
 import java.util.Locale;
 
-import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 
 import jakarta.annotation.PostConstruct;
@@ -25,22 +24,16 @@ import stirling.software.common.util.TempFileManager;
 public class PdfJsonFontService {
 
     private final TempFileManager tempFileManager;
+    private final stirling.software.common.model.ApplicationProperties applicationProperties;
 
-    @Getter
-    @Value("${stirling.pdf.json.cff-converter.enabled:true}")
-    private boolean cffConversionEnabled;
+    @Getter private boolean cffConversionEnabled;
 
-    @Getter
-    @Value("${stirling.pdf.json.cff-converter.method:python}")
-    private String cffConverterMethod;
+    @Getter private String cffConverterMethod;
 
-    @Value("${stirling.pdf.json.cff-converter.python-command:/opt/venv/bin/python3}")
     private String pythonCommand;
 
-    @Value("${stirling.pdf.json.cff-converter.python-script:/scripts/convert_cff_to_ttf.py}")
     private String pythonScript;
 
-    @Value("${stirling.pdf.json.cff-converter.fontforge-command:fontforge}")
     private String fontforgeCommand;
 
     private volatile boolean pythonCffConverterAvailable;
@@ -48,6 +41,7 @@ public class PdfJsonFontService {
 
     @PostConstruct
     private void initialiseCffConverterAvailability() {
+        loadConfiguration();
         if (!cffConversionEnabled) {
             log.warn("[FONT-DEBUG] CFF conversion is DISABLED in configuration");
             pythonCffConverterAvailable = false;
@@ -77,6 +71,22 @@ public class PdfJsonFontService {
         log.info("[FONT-DEBUG] Selected CFF converter method: {}", cffConverterMethod);
     }
 
+    private void loadConfiguration() {
+        if (applicationProperties.getPdfEditor() != null
+                && applicationProperties.getPdfEditor().getCffConverter() != null) {
+            var cfg = applicationProperties.getPdfEditor().getCffConverter();
+            this.cffConversionEnabled = cfg.isEnabled();
+            this.cffConverterMethod = cfg.getMethod();
+            this.pythonCommand = cfg.getPythonCommand();
+            this.pythonScript = cfg.getPythonScript();
+            this.fontforgeCommand = cfg.getFontforgeCommand();
+        } else {
+            // Use defaults when config is not available
+            this.cffConversionEnabled = false;
+            log.warn("[FONT-DEBUG] PdfEditor configuration not available, CFF conversion disabled");
+        }
+    }
+
     public byte[] convertCffProgramToTrueType(byte[] fontBytes, String toUnicode) {
         if (!cffConversionEnabled || fontBytes == null || fontBytes.length == 0) {
             log.warn(

app/core/src/main/java/stirling/software/SPDF/service/pdfjson/type3/Type3LibraryStrategy.java

@@ -2,7 +2,6 @@ package stirling.software.SPDF.service.pdfjson.type3;
 
 import java.io.IOException;
 
-import org.springframework.beans.factory.annotation.Value;
 import org.springframework.core.annotation.Order;
 import org.springframework.stereotype.Component;
 
@@ -23,8 +22,8 @@ import stirling.software.SPDF.service.pdfjson.type3.library.Type3FontLibraryPayl
 public class Type3LibraryStrategy implements Type3ConversionStrategy {
 
     private final Type3FontLibrary fontLibrary;
+    private final stirling.software.common.model.ApplicationProperties applicationProperties;
 
-    @Value("${stirling.pdf.json.type3.library.enabled:true}")
     private boolean enabled;
 
     @Override
@@ -42,6 +41,19 @@ public class Type3LibraryStrategy implements Type3ConversionStrategy {
         return enabled && fontLibrary != null && fontLibrary.isLoaded();
     }
 
+    @jakarta.annotation.PostConstruct
+    private void loadConfiguration() {
+        if (applicationProperties.getPdfEditor() != null
+                && applicationProperties.getPdfEditor().getType3() != null
+                && applicationProperties.getPdfEditor().getType3().getLibrary() != null) {
+            var cfg = applicationProperties.getPdfEditor().getType3().getLibrary();
+            this.enabled = cfg.isEnabled();
+        } else {
+            this.enabled = false;
+            log.warn("PdfEditor Type3 library configuration not available, disabled");
+        }
+    }
+
     @Override
     public PdfJsonFontConversionCandidate convert(
             Type3ConversionRequest request, Type3GlyphContext context) throws IOException {

app/core/src/main/java/stirling/software/SPDF/service/pdfjson/type3/library/Type3FontLibrary.java

@@ -14,7 +14,6 @@ import java.util.stream.Collectors;
 
 import org.apache.pdfbox.cos.COSName;
 import org.apache.pdfbox.pdmodel.font.PDType3Font;
-import org.springframework.beans.factory.annotation.Value;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.ResourceLoader;
 import org.springframework.stereotype.Component;
@@ -34,8 +33,8 @@ public class Type3FontLibrary {
 
     private final ObjectMapper objectMapper;
     private final ResourceLoader resourceLoader;
+    private final stirling.software.common.model.ApplicationProperties applicationProperties;
 
-    @Value("${stirling.pdf.json.type3.library.index:classpath:/type3/library/index.json}")
     private String indexLocation;
 
     private final Map<String, Type3FontLibraryEntry> signatureIndex = new ConcurrentHashMap<>();
@@ -44,6 +43,17 @@ public class Type3FontLibrary {
 
     @jakarta.annotation.PostConstruct
     void initialise() {
+        if (applicationProperties.getPdfEditor() != null
+                && applicationProperties.getPdfEditor().getType3() != null
+                && applicationProperties.getPdfEditor().getType3().getLibrary() != null) {
+            this.indexLocation =
+                    applicationProperties.getPdfEditor().getType3().getLibrary().getIndex();
+        } else {
+            log.warn(
+                    "[TYPE3] PdfEditor Type3 library configuration not available; Type3 library disabled");
+            entries = List.of();
+            return;
+        }
         Resource resource = resourceLoader.getResource(indexLocation);
         if (!resource.exists()) {
             log.info("[TYPE3] Library index {} not found; Type3 library disabled", indexLocation);

app/core/src/main/resources/settings.yml.template

@@ -12,7 +12,6 @@
 
 security:
   enableLogin: true # set to 'true' to enable login
-  csrfDisabled: false # set to 'true' to disable CSRF protection (not recommended for production)
   loginAttemptCount: 5 # lock user account after 5 tries; when using e.g. Fail2Ban you can deactivate the function with -1
   loginResetTimeMinutes: 120 # lock account for 2 hours after x attempts
   loginMethod: all # Accepts values like 'all' and 'normal'(only Login with Username/Password), 'oauth2'(only Login with OAuth2) or 'saml2'(only Login with SAML2)
@@ -59,6 +58,8 @@ security:
     idpCert: classpath:okta.cert # The certificate your Provider will use to authenticate your app's SAML authentication requests. Provided by your Provider
     privateKey: classpath:saml-private-key.key # Your private key. Generated from your keypair
     spCert: classpath:saml-public-cert.crt # Your signing certificate. Generated from your keypair
+    # IMPORTANT: For SAML setup, download your SP metadata from the BACKEND URL: http://localhost:8080/saml2/service-provider-metadata/{registrationId}
+    # Do NOT use the frontend dev server URL (localhost:5173) as it will generate incorrect ACS URLs. Always use the backend URL (localhost:8080) for SAML configuration.
   jwt: # This feature is currently under development and not yet fully supported. Do not use in production.
     persistence: true # Set to 'true' to enable JWT key store
     enableKeyRotation: true # Set to 'true' to enable key pair rotation
@@ -105,6 +106,11 @@ mail:
   username: '' # SMTP server username
   password: '' # SMTP server password
   from: '' # sender email address
+  startTlsEnable: true # enable STARTTLS (explicit TLS upgrade after connecting) when supported by the SMTP server
+  startTlsRequired: false # require STARTTLS; connection fails if the upgrade command is not supported
+  sslEnable: false # enable SSL/TLS wrapper for implicit TLS (typically used with port 465)
+  sslTrust: '' # optional trusted host override, e.g. "smtp.example.com" or "*"; defaults to "*" (trust all) when empty
+  sslCheckServerIdentity: false # enable hostname verification when using SSL/TLS
 
 legal:
   termsAndConditions: https://www.stirling.com/legal/terms-of-service # URL to the terms and conditions of your application (e.g. https://example.com/terms). Empty string to disable or filename to load from local file in static folder
@@ -122,13 +128,15 @@ system:
   customHTMLFiles: false # enable to have files placed in /customFiles/templates override the existing template HTML files
   tessdataDir: /usr/share/tessdata # path to the directory containing the Tessdata files. This setting is relevant for Windows systems. For Windows users, this path should be adjusted to point to the appropriate directory where the Tessdata files are stored.
   enableAnalytics: null # Master toggle for analytics: set to 'true' to enable all analytics, 'false' to disable all analytics, or leave as 'null' to prompt admin on first launch
+  enableDesktopInstallSlide: true # Set to 'false' to hide the desktop app installation slide in the onboarding flow
   enablePosthog: null # Enable PostHog analytics (open-source product analytics): set to 'true' to enable, 'false' to disable, or 'null' to enable by default when analytics is enabled
   enableScarf: null # Enable Scarf tracking pixel: set to 'true' to enable, 'false' to disable, or 'null' to enable by default when analytics is enabled
   enableUrlToPDF: false # Set to 'true' to enable URL to PDF, INTERNAL ONLY, known security issues, should not be used externally
   disableSanitize: false # set to true to disable Sanitize HTML; (can lead to injections in HTML)
   maxDPI: 500 # Maximum allowed DPI for PDF to image conversion
-  corsAllowedOrigins: [] # List of allowed origins for CORS (e.g. ['http://localhost:5173', 'https://app.example.com']). Leave empty to disable CORS.
-  frontendUrl: '' # Base URL for frontend (e.g. 'https://pdf.example.com'). Used for generating invite links in emails. If empty, falls back to backend URL.
+  corsAllowedOrigins: [] # List of allowed origins for CORS (e.g. ['http://localhost:5173', 'https://app.example.com']). Leave empty to disable CORS. For local development with frontend on port 5173, add 'http://localhost:5173'
+  backendUrl: '' # Backend base URL for SAML/OAuth/API callbacks (e.g. 'http://localhost:8080' for dev, 'https://api.example.com' for production). REQUIRED for SSO authentication to work correctly. This is where your IdP will send SAML responses and OAuth callbacks. Leave empty to default to 'http://localhost:8080' in development.
+  frontendUrl: '' # Frontend URL for invite email links (e.g. 'https://app.example.com'). Optional - if not set, will use backendUrl. This is the URL users click in invite emails.
   serverCertificate:
     enabled: true # Enable server-side certificate for "Sign with Stirling-PDF" option
     organizationName: Stirling-PDF # Organization name for generated certificates
@@ -174,23 +182,6 @@ system:
   databaseBackup:
     cron: '0 0 0 * * ?' # Cron expression for automatic database backups "0 0 0 * * ?" daily at midnight
 
-stirling:
-  pdf:
-    fallback-font: classpath:/static/fonts/NotoSans-Regular.ttf # Override to point at a custom fallback font
-    json:
-      font-normalization:
-        enabled: false # IMPORTANT: Disable to preserve ToUnicode CMaps for correct font rendering. Ghostscript strips Unicode mappings from CID fonts.
-      cff-converter:
-        enabled: true # Wrap CFF/Type1C fonts as OpenType-CFF for browser compatibility
-        method: python # Converter method: 'python' (fontTools, recommended - wraps as OTF), 'fontforge' (legacy - converts to TTF, may hang on CID fonts)
-        python-command: /opt/venv/bin/python3 # Python interpreter path
-        python-script: /scripts/convert_cff_to_ttf.py # Path to font wrapping script
-        fontforge-command: fontforge # Override if FontForge is installed under a different name/path
-      type3:
-        library:
-          enabled: true # Match common Type3 fonts against the built-in library of converted programs
-          index: classpath:/type3/library/index.json # Override to point at a custom index.json (supports http:, file:, classpath:)
-
 ui:
   appNameNavbar: '' # name displayed on the navigation bar
   logoStyle: classic # Options: 'classic' (default - classic S icon) or 'modern' (minimalist logo)
@@ -219,6 +210,7 @@ processExecutor:
     weasyPrintSessionLimit: 16
     installAppSessionLimit: 1
     calibreSessionLimit: 1
+    imageMagickSessionLimit: 4
     ghostscriptSessionLimit: 8
     ocrMyPdfSessionLimit: 2
   timeoutMinutes: # Process executor timeout in minutes
@@ -228,7 +220,26 @@ processExecutor:
     weasyPrinttimeoutMinutes: 30
     installApptimeoutMinutes: 60
     calibretimeoutMinutes: 30
+    imageMagickTimeoutMinutes: 30
     tesseractTimeoutMinutes: 30
     qpdfTimeoutMinutes: 30
     ghostscriptTimeoutMinutes: 30
     ocrMyPdfTimeoutMinutes: 30
+
+pdfEditor:
+  fallback-font: classpath:/static/fonts/NotoSans-Regular.ttf # Override to point at a custom fallback font
+  cache:
+    max-bytes: -1 # Max in-memory cache size in bytes; -1 disables byte cap
+    max-percent: 20 # Max in-memory cache as % of JVM max; used when max-bytes <= 0
+  font-normalization:
+    enabled: false # IMPORTANT: Disable to preserve ToUnicode CMaps for correct font rendering. Ghostscript strips Unicode mappings from CID fonts.
+  cff-converter:
+    enabled: true # Wrap CFF/Type1CFF fonts as OpenType-CFF for browser compatibility
+    method: python # Converter method: 'python' (fontTools, recommended - wraps as OTF), 'fontforge' (legacy - converts to TTF, may hang on CID fonts)
+    python-command: /opt/venv/bin/python3 # Python interpreter path
+    python-script: /scripts/convert_cff_to_ttf.py # Path to font wrapping script
+    fontforge-command: fontforge # Override if FontForge is installed under a different name/path
+  type3:
+    library:
+      enabled: true # Match common Type3 fonts against the built-in library of converted programs
+      index: classpath:/type3/library/index.json # Override to point at a custom index.json (supports http:, file:, classpath:)

app/core/src/test/java/stirling/software/SPDF/controller/api/security/CertSignControllerTest.java

@@ -1,9 +1,10 @@
 package stirling.software.SPDF.controller.api.security;
 
 import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.lenient;
 
 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
@@ -107,7 +108,8 @@ class CertSignControllerTest {
             derCertBytes = baos.toByteArray();
         }
 
-        when(pdfDocumentFactory.load(any(MultipartFile.class)))
+        lenient()
+                .when(pdfDocumentFactory.load(any(MultipartFile.class)))
                 .thenAnswer(
                         invocation -> {
                             MultipartFile file = invocation.getArgument(0);
@@ -167,6 +169,31 @@ class CertSignControllerTest {
         assertTrue(response.getBody().length > 0);
     }
 
+    @Test
+    void testSignPdfWithMissingPkcs12FileThrowsError() {
+        MockMultipartFile pdfFile =
+                new MockMultipartFile(
+                        "fileInput", "test.pdf", MediaType.APPLICATION_PDF_VALUE, pdfBytes);
+
+        SignPDFWithCertRequest request = new SignPDFWithCertRequest();
+        request.setFileInput(pdfFile);
+        request.setCertType("PFX");
+        request.setPassword("password");
+        request.setShowSignature(false);
+        request.setReason("test");
+        request.setLocation("test");
+        request.setName("tester");
+        request.setPageNumber(1);
+        request.setShowLogo(false);
+
+        IllegalArgumentException exception =
+                assertThrows(
+                        IllegalArgumentException.class,
+                        () -> certSignController.signPDFWithCert(request));
+
+        assertTrue(exception.getMessage().contains("PKCS12 keystore"));
+    }
+
     @Test
     void testSignPdfWithJks() throws Exception {
         MockMultipartFile pdfFile =

app/proprietary/src/main/java/stirling/software/proprietary/controller/api/ProprietaryUIDataController.java

@@ -94,6 +94,22 @@ public class ProprietaryUIDataController {
         this.auditRepository = auditRepository;
     }
 
+    /**
+     * Get the backend base URL for SAML/OAuth redirects. Uses system.backendUrl from config if set,
+     * otherwise defaults to http://localhost:8080
+     */
+    private String getBackendBaseUrl() {
+        String backendUrl = applicationProperties.getSystem().getBackendUrl();
+
+        // If backendUrl is configured, use it
+        if (backendUrl != null && !backendUrl.trim().isEmpty()) {
+            return backendUrl.trim();
+        }
+
+        // For development, default to localhost:8080 (backend port)
+        return "http://localhost:8080";
+    }
+
     @GetMapping("/audit-dashboard")
     @PreAuthorize("hasRole('ADMIN')")
     @EnterpriseEndpoint
@@ -185,14 +201,17 @@ public class ProprietaryUIDataController {
         }
 
         SAML2 saml2 = securityProps.getSaml2();
-        if (securityProps.isSaml2Active()
-                && applicationProperties.getSystem().getEnableAlphaFunctionality()
-                && applicationProperties.getPremium().isEnabled()) {
+        if (securityProps.isSaml2Active() && applicationProperties.getPremium().isEnabled()) {
             String samlIdp = saml2.getProvider();
             String saml2AuthenticationPath = "/saml2/authenticate/" + saml2.getRegistrationId();
 
+            // For SAML, we need to use the backend URL directly, not a relative path
+            // This ensures Spring Security generates the correct ACS URL
+            String backendUrl = getBackendBaseUrl();
+            String fullSamlPath = backendUrl + saml2AuthenticationPath;
+
             if (!applicationProperties.getPremium().getProFeatures().isSsoAutoLogin()) {
-                providerList.put(saml2AuthenticationPath, samlIdp + " (SAML 2)");
+                providerList.put(fullSamlPath, samlIdp + " (SAML 2)");
             }
         }
 
@@ -205,6 +224,10 @@ public class ProprietaryUIDataController {
         data.setLoginMethod(securityProps.getLoginMethod());
         data.setAltLogin(!providerList.isEmpty() && securityProps.isAltLogin());
 
+        // Add language configuration for login page
+        data.setLanguages(applicationProperties.getUi().getLanguages());
+        data.setDefaultLocale(applicationProperties.getSystem().getDefaultLocale());
+
         return ResponseEntity.ok(data);
     }
 
@@ -328,6 +351,7 @@ public class ProprietaryUIDataController {
         data.setGrandfatheredUserCount(grandfatheredCount);
         data.setLicenseMaxUsers(licenseMaxUsers);
         data.setPremiumEnabled(premiumEnabled);
+        data.setMailEnabled(applicationProperties.getMail().isEnabled());
 
         return ResponseEntity.ok(data);
     }
@@ -376,7 +400,7 @@ public class ProprietaryUIDataController {
         data.setUsername(username);
         data.setRole(user.get().getRolesAsString());
         data.setSettings(settingsJson);
-        data.setChangeCredsFlag(user.get().isFirstLogin());
+        data.setChangeCredsFlag(user.get().isFirstLogin() || user.get().isForcePasswordChange());
         data.setOAuth2Login(isOAuth2Login);
         data.setSaml2Login(isSaml2Login);
 
@@ -491,6 +515,8 @@ public class ProprietaryUIDataController {
         private boolean altLogin;
         private boolean firstTimeSetup;
         private boolean showDefaultCredentials;
+        private List<String> languages;
+        private String defaultLocale;
     }
 
     @Data
@@ -510,6 +536,7 @@ public class ProprietaryUIDataController {
         private int grandfatheredUserCount;
         private int licenseMaxUsers;
         private boolean premiumEnabled;
+        private boolean mailEnabled;
     }
 
     @Data

app/proprietary/src/main/java/stirling/software/proprietary/controller/api/SignatureController.java

@@ -22,7 +22,6 @@ import org.springframework.web.bind.annotation.RestController;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
-import stirling.software.common.annotations.api.UserApi;
 import stirling.software.common.configuration.InstallationPathConfig;
 import stirling.software.proprietary.model.api.signature.SavedSignatureRequest;
 import stirling.software.proprietary.model.api.signature.SavedSignatureResponse;
@@ -34,7 +33,6 @@ import stirling.software.proprietary.service.SignatureService;
  * authentication and enforces per-user storage limits. All endpoints require authentication
  * via @PreAuthorize("isAuthenticated()").
  */
-@UserApi
 @Slf4j
 @RestController
 @RequestMapping("/api/v1/proprietary/signatures")

app/proprietary/src/main/java/stirling/software/proprietary/security/config/AccountWebController.java

@@ -120,9 +120,7 @@ public class AccountWebController {
 
         SAML2 saml2 = securityProps.getSaml2();
 
-        if (securityProps.isSaml2Active()
-                && applicationProperties.getSystem().getEnableAlphaFunctionality()
-                && applicationProperties.getPremium().isEnabled()) {
+        if (securityProps.isSaml2Active() && applicationProperties.getPremium().isEnabled()) {
             String samlIdp = saml2.getProvider();
             String saml2AuthenticationPath = "/saml2/authenticate/" + saml2.getRegistrationId();
 

app/proprietary/src/main/java/stirling/software/proprietary/security/configuration/MailConfig.java

@@ -33,7 +33,8 @@ public class MailConfig {
 
         // Creates a new instance of JavaMailSenderImpl, which is a Spring implementation
         JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
-        mailSender.setHost(mailProperties.getHost());
+        String host = mailProperties.getHost();
+        mailSender.setHost(host);
         mailSender.setPort(mailProperties.getPort());
         mailSender.setDefaultEncoding("UTF-8");
 
@@ -70,8 +71,32 @@ public class MailConfig {
             log.info("SMTP authentication disabled - no credentials provided");
         }
 
+        boolean startTlsEnabled =
+                mailProperties.getStartTlsEnable() == null || mailProperties.getStartTlsEnable();
         // Enables STARTTLS to encrypt the connection if supported by the SMTP server
-        props.put("mail.smtp.starttls.enable", "true");
+        props.put("mail.smtp.starttls.enable", Boolean.toString(startTlsEnabled));
+        if (mailProperties.getStartTlsRequired() != null) {
+            props.put(
+                    "mail.smtp.starttls.required", mailProperties.getStartTlsRequired().toString());
+        }
+
+        if (mailProperties.getSslEnable() != null) {
+            props.put("mail.smtp.ssl.enable", mailProperties.getSslEnable().toString());
+        }
+
+        // Trust the configured host to allow STARTTLS with self-signed certificates
+        String sslTrust = mailProperties.getSslTrust();
+        if (sslTrust == null || sslTrust.trim().isEmpty()) {
+            sslTrust = "*";
+        }
+        if (sslTrust != null && !sslTrust.trim().isEmpty()) {
+            props.put("mail.smtp.ssl.trust", sslTrust);
+        }
+        if (mailProperties.getSslCheckServerIdentity() != null) {
+            props.put(
+                    "mail.smtp.ssl.checkserveridentity",
+                    mailProperties.getSslCheckServerIdentity().toString());
+        }
 
         // Returns the configured mail sender, ready to send emails
         return mailSender;

app/proprietary/src/main/java/stirling/software/proprietary/security/configuration/SecurityConfiguration.java

@@ -1,7 +1,6 @@
 package stirling.software.proprietary.security.configuration;
 
 import java.util.List;
-import java.util.Optional;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
@@ -25,8 +24,6 @@ import org.springframework.security.saml2.provider.service.web.authentication.Op
 import org.springframework.security.web.SecurityFilterChain;
 import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
 import org.springframework.security.web.authentication.rememberme.PersistentTokenRepository;
-import org.springframework.security.web.csrf.CookieCsrfTokenRepository;
-import org.springframework.security.web.csrf.CsrfTokenRequestAttributeHandler;
 import org.springframework.security.web.savedrequest.NullRequestCache;
 import org.springframework.security.web.servlet.util.matcher.PathPatternRequestMatcher;
 import org.springframework.web.cors.CorsConfiguration;
@@ -47,7 +44,6 @@ import stirling.software.proprietary.security.database.repository.PersistentLogi
 import stirling.software.proprietary.security.filter.IPRateLimitingFilter;
 import stirling.software.proprietary.security.filter.JwtAuthenticationFilter;
 import stirling.software.proprietary.security.filter.UserAuthenticationFilter;
-import stirling.software.proprietary.security.model.User;
 import stirling.software.proprietary.security.oauth2.CustomOAuth2AuthenticationFailureHandler;
 import stirling.software.proprietary.security.oauth2.CustomOAuth2AuthenticationSuccessHandler;
 import stirling.software.proprietary.security.saml2.CustomSaml2AuthenticationFailureHandler;
@@ -198,74 +194,19 @@ public class SecurityConfiguration {
             http.cors(cors -> cors.disable());
         }
 
-        if (securityProperties.getCsrfDisabled() || !loginEnabledValue) {
-            http.csrf(CsrfConfigurer::disable);
-        }
+        http.csrf(CsrfConfigurer::disable);
 
         if (loginEnabledValue) {
-            boolean v2Enabled = appConfig.v2Enabled();
 
             http.addFilterBefore(
                             userAuthenticationFilter, UsernamePasswordAuthenticationFilter.class)
                     .addFilterBefore(rateLimitingFilter, UsernamePasswordAuthenticationFilter.class)
                     .addFilterBefore(jwtAuthenticationFilter, UserAuthenticationFilter.class);
 
-            if (!securityProperties.getCsrfDisabled()) {
-                CookieCsrfTokenRepository cookieRepo =
-                        CookieCsrfTokenRepository.withHttpOnlyFalse();
-                CsrfTokenRequestAttributeHandler requestHandler =
-                        new CsrfTokenRequestAttributeHandler();
-                requestHandler.setCsrfRequestAttributeName(null);
-                http.csrf(
-                        csrf ->
-                                csrf.ignoringRequestMatchers(
-                                                request -> {
-                                                    String uri = request.getRequestURI();
-
-                                                    // Ignore CSRF for auth endpoints
-                                                    if (uri.startsWith("/api/v1/auth/")) {
-                                                        return true;
-                                                    }
-
-                                                    String apiKey = request.getHeader("X-API-KEY");
-                                                    // If there's no API key, don't ignore CSRF
-                                                    // (return false)
-                                                    if (apiKey == null || apiKey.trim().isEmpty()) {
-                                                        return false;
-                                                    }
-                                                    // Validate API key using existing UserService
-                                                    try {
-                                                        Optional<User> user =
-                                                                userService.getUserByApiKey(apiKey);
-                                                        // If API key is valid, ignore CSRF (return
-                                                        // true)
-                                                        // If API key is invalid, don't ignore CSRF
-                                                        // (return false)
-                                                        return user.isPresent();
-                                                    } catch (Exception e) {
-                                                        // If there's any error validating the API
-                                                        // key, don't ignore CSRF
-                                                        return false;
-                                                    }
-                                                })
-                                        .csrfTokenRepository(cookieRepo)
-                                        .csrfTokenRequestHandler(requestHandler));
-            }
-
             http.sessionManagement(
-                    sessionManagement -> {
-                        if (v2Enabled) {
+                    sessionManagement ->
                             sessionManagement.sessionCreationPolicy(
-                                    SessionCreationPolicy.STATELESS);
-                        } else {
-                            sessionManagement
-                                    .sessionCreationPolicy(SessionCreationPolicy.IF_REQUIRED)
-                                    .maximumSessions(10)
-                                    .maxSessionsPreventsLogin(false)
-                                    .sessionRegistry(sessionRegistry)
-                                    .expiredUrl("/login?logout=true");
-                        }
-                    });
+                                    SessionCreationPolicy.STATELESS));
             http.authenticationProvider(daoAuthenticationProvider());
             http.requestCache(requestCache -> requestCache.requestCache(new NullRequestCache()));
 
@@ -331,7 +272,9 @@ public class SecurityConfiguration {
                         formLogin ->
                                 formLogin
                                         .loginPage("/login") // Redirect here when unauthenticated
-                                        .loginProcessingUrl("/perform_login") // Process form posts here (not /login)
+                                        .loginProcessingUrl(
+                                                "/perform_login") // Process form posts here (not
+                                        // /login)
                                         .successHandler(
                                                 new CustomAuthenticationSuccessHandler(
                                                         loginAttemptService,
@@ -346,18 +289,7 @@ public class SecurityConfiguration {
             if (securityProperties.isOauth2Active()) {
                 http.oauth2Login(
                         oauth2 -> {
-                            // v1: Use /oauth2 as login page for Thymeleaf templates
-                            if (!v2Enabled) {
-                                oauth2.loginPage("/oauth2");
-                            }
-
-                            // v2: Don't set loginPage, let default OAuth2 flow handle it
-                            oauth2
-                                    /*
-                                       This Custom handler is used to check if the OAUTH2 user trying to log in, already exists in the database.
-                                       If user exists, login proceeds as usual. If user does not exist, then it is auto-created but only if 'OAUTH2AutoCreateUser'
-                                       is set as true, else login fails with an error message advising the same.
-                                    */
+                            oauth2.loginPage("/login")
                                     .successHandler(
                                             new CustomOAuth2AuthenticationSuccessHandler(
                                                     loginAttemptService,
@@ -391,12 +323,8 @@ public class SecurityConfiguration {
                         .saml2Login(
                                 saml2 -> {
                                     try {
-                                        // Only set login page for v1/Thymeleaf mode
-                                        if (!v2Enabled) {
-                                            saml2.loginPage("/saml2");
-                                        }
-
-                                        saml2.relyingPartyRegistrationRepository(
+                                        saml2.loginPage("/login")
+                                                .relyingPartyRegistrationRepository(
                                                         saml2RelyingPartyRegistrations)
                                                 .authenticationManager(
                                                         new ProviderManager(authenticationProvider))
@@ -406,7 +334,8 @@ public class SecurityConfiguration {
                                                                 securityProperties.getSaml2(),
                                                                 userService,
                                                                 jwtService,
-                                                                licenseSettingsService))
+                                                                licenseSettingsService,
+                                                                applicationProperties))
                                                 .failureHandler(
                                                         new CustomSaml2AuthenticationFailureHandler())
                                                 .authenticationRequestResolver(

app/proprietary/src/main/java/stirling/software/proprietary/security/controller/api/AuthController.java

@@ -244,10 +244,13 @@ public class AuthController {
         userMap.put("username", user.getUsername());
         userMap.put("role", user.getRolesAsString());
         userMap.put("enabled", user.isEnabled());
+        userMap.put(
+                "authenticationType",
+                user.getAuthenticationType()); // Expose authentication type for SSO detection
 
         // Add metadata for OAuth compatibility
         Map<String, Object> appMetadata = new HashMap<>();
-        appMetadata.put("provider", user.getAuthenticationType()); // Default to email provider
+        appMetadata.put("provider", user.getAuthenticationType());
         userMap.put("app_metadata", appMetadata);
 
         return userMap;

app/proprietary/src/main/java/stirling/software/proprietary/security/controller/api/UserController.java

@@ -7,6 +7,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.UUID;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
@@ -18,6 +19,7 @@ import org.springframework.security.oauth2.core.user.OAuth2User;
 import org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler;
 import org.springframework.web.bind.annotation.*;
 
+import jakarta.mail.MessagingException;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import jakarta.transaction.Transactional;
@@ -236,6 +238,8 @@ public class UserController {
             return ResponseEntity.status(HttpStatus.UNAUTHORIZED)
                     .body(Map.of("error", "incorrectPassword", "message", "Incorrect password"));
         }
+        // Set flags before changing password so they're saved together
+        user.setForcePasswordChange(false);
         userService.changePassword(user, newPassword);
         userService.changeFirstUse(user, false);
         // Logout using Spring's utility
@@ -584,6 +588,79 @@ public class UserController {
         return ResponseEntity.ok(Map.of("message", "User role updated successfully"));
     }
 
+    @PreAuthorize("hasRole('ROLE_ADMIN')")
+    @PostMapping("/admin/changePasswordForUser")
+    public ResponseEntity<?> changePasswordForUser(
+            @RequestParam(name = "username") String username,
+            @RequestParam(name = "newPassword", required = false) String newPassword,
+            @RequestParam(name = "generateRandom", defaultValue = "false") boolean generateRandom,
+            @RequestParam(name = "sendEmail", defaultValue = "false") boolean sendEmail,
+            @RequestParam(name = "includePassword", defaultValue = "false") boolean includePassword,
+            @RequestParam(name = "forcePasswordChange", defaultValue = "false")
+                    boolean forcePasswordChange,
+            HttpServletRequest request,
+            Authentication authentication)
+            throws SQLException, UnsupportedProviderException, MessagingException {
+        Optional<User> userOpt = userService.findByUsernameIgnoreCase(username);
+        if (userOpt.isEmpty()) {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND)
+                    .body(Map.of("error", "User not found."));
+        }
+
+        String currentUsername = authentication.getName();
+        if (currentUsername.equalsIgnoreCase(username)) {
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST)
+                    .body(Map.of("error", "Cannot change your own password."));
+        }
+
+        User user = userOpt.get();
+
+        String finalPassword = newPassword;
+        if (generateRandom) {
+            finalPassword = UUID.randomUUID().toString().replace("-", "").substring(0, 12);
+        }
+
+        if (finalPassword == null || finalPassword.trim().isEmpty()) {
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST)
+                    .body(Map.of("error", "New password is required."));
+        }
+
+        // Set force password change flag before changing password so both are saved together
+        user.setForcePasswordChange(forcePasswordChange);
+        userService.changePassword(user, finalPassword);
+
+        // Invalidate all active sessions to force reauthentication
+        userService.invalidateUserSessions(username);
+
+        if (sendEmail) {
+            if (emailService.isEmpty() || !applicationProperties.getMail().isEnabled()) {
+                return ResponseEntity.status(HttpStatus.BAD_REQUEST)
+                        .body(Map.of("error", "Email is not configured."));
+            }
+
+            String userEmail = user.getUsername();
+            // Check if username is a valid email format
+            if (userEmail == null || userEmail.isBlank() || !userEmail.contains("@")) {
+                return ResponseEntity.status(HttpStatus.BAD_REQUEST)
+                        .body(
+                                Map.of(
+                                        "error",
+                                        "User's email is not a valid email address. Notifications are disabled."));
+            }
+
+            String loginUrl = buildLoginUrl(request);
+            emailService
+                    .get()
+                    .sendPasswordChangedNotification(
+                            userEmail,
+                            user.getUsername(),
+                            includePassword ? finalPassword : null,
+                            loginUrl);
+        }
+
+        return ResponseEntity.ok(Map.of("message", "User password updated successfully"));
+    }
+
     @PreAuthorize("hasRole('ROLE_ADMIN')")
     @PostMapping("/admin/changeUserEnabled/{username}")
     public ResponseEntity<?> changeUserEnabled(

app/proprietary/src/main/java/stirling/software/proprietary/security/filter/JwtAuthenticationFilter.java

@@ -26,6 +26,7 @@ import jakarta.servlet.ServletException;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 
+import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 import stirling.software.common.model.ApplicationProperties;
@@ -39,6 +40,7 @@ import stirling.software.proprietary.security.service.JwtServiceInterface;
 import stirling.software.proprietary.security.service.UserService;
 
 @Slf4j
+@RequiredArgsConstructor
 public class JwtAuthenticationFilter extends OncePerRequestFilter {
 
     private final JwtServiceInterface jwtService;
@@ -47,19 +49,6 @@ public class JwtAuthenticationFilter extends OncePerRequestFilter {
     private final AuthenticationEntryPoint authenticationEntryPoint;
     private final ApplicationProperties.Security securityProperties;
 
-    public JwtAuthenticationFilter(
-            JwtServiceInterface jwtService,
-            UserService userService,
-            CustomUserDetailsService userDetailsService,
-            AuthenticationEntryPoint authenticationEntryPoint,
-            ApplicationProperties.Security securityProperties) {
-        this.jwtService = jwtService;
-        this.userService = userService;
-        this.userDetailsService = userDetailsService;
-        this.authenticationEntryPoint = authenticationEntryPoint;
-        this.securityProperties = securityProperties;
-    }
-
     @Override
     protected void doFilterInternal(
             HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
@@ -68,7 +57,11 @@ public class JwtAuthenticationFilter extends OncePerRequestFilter {
             filterChain.doFilter(request, response);
             return;
         }
-        if (isStaticResource(request.getContextPath(), request.getRequestURI())) {
+
+        String requestURI = request.getRequestURI();
+        String contextPath = request.getContextPath();
+
+        if (isStaticResource(contextPath, requestURI)) {
             filterChain.doFilter(request, response);
             return;
         }
@@ -77,10 +70,7 @@ public class JwtAuthenticationFilter extends OncePerRequestFilter {
             String jwtToken = jwtService.extractToken(request);
 
             if (jwtToken == null) {
-                // Allow specific auth endpoints to pass through without JWT
-                String requestURI = request.getRequestURI();
-                String contextPath = request.getContextPath();
-
+                // Allow auth endpoints to pass through without JWT
                 if (!isPublicAuthEndpoint(requestURI, contextPath)) {
                     // For API requests, return 401 JSON
                     String acceptHeader = request.getHeader("Accept");

app/proprietary/src/main/java/stirling/software/proprietary/security/filter/UserAuthenticationFilter.java

@@ -241,24 +241,6 @@ public class UserAuthenticationFilter extends OncePerRequestFilter {
         filterChain.doFilter(request, response);
     }
 
-    private static boolean isPublicAuthEndpoint(String requestURI, String contextPath) {
-        // Remove context path from URI to normalize path matching
-        String trimmedUri =
-                requestURI.startsWith(contextPath)
-                        ? requestURI.substring(contextPath.length())
-                        : requestURI;
-
-        // Public auth endpoints that don't require authentication
-        return trimmedUri.startsWith("/login")
-                || trimmedUri.startsWith("/auth/")
-                || trimmedUri.startsWith("/oauth2")
-                || trimmedUri.startsWith("/saml2")
-                || trimmedUri.startsWith("/api/v1/auth/login")
-                || trimmedUri.startsWith("/api/v1/auth/refresh")
-                || trimmedUri.startsWith("/api/v1/auth/logout")
-                || trimmedUri.startsWith("/api/v1/proprietary/ui-data/login");
-    }
-
     private enum UserLoginType {
         USERDETAILS("UserDetails"),
         OAUTH2USER("OAuth2User"),

app/proprietary/src/main/java/stirling/software/proprietary/security/model/User.java

@@ -59,6 +59,9 @@ public class User implements UserDetails, Serializable {
     @Column(name = "hasCompletedInitialSetup")
     private Boolean hasCompletedInitialSetup = false;
 
+    @Column(name = "forcePasswordChange")
+    private Boolean forcePasswordChange = false;
+
     @Column(name = "roleName")
     private String roleName;
 
@@ -117,6 +120,14 @@ public class User implements UserDetails, Serializable {
         this.hasCompletedInitialSetup = hasCompletedInitialSetup;
     }
 
+    public boolean isForcePasswordChange() {
+        return forcePasswordChange != null && forcePasswordChange;
+    }
+
+    public void setForcePasswordChange(boolean forcePasswordChange) {
+        this.forcePasswordChange = forcePasswordChange;
+    }
+
     public void setAuthenticationType(AuthenticationType authenticationType) {
         this.authenticationType = authenticationType.toString().toLowerCase();
     }

app/proprietary/src/main/java/stirling/software/proprietary/security/oauth2/CustomOAuth2AuthenticationSuccessHandler.java

@@ -27,6 +27,7 @@ import jakarta.servlet.http.HttpServletResponse;
 import jakarta.servlet.http.HttpSession;
 
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 
 import stirling.software.common.model.ApplicationProperties;
 import stirling.software.common.model.exception.UnsupportedProviderException;
@@ -39,6 +40,7 @@ import stirling.software.proprietary.security.service.JwtServiceInterface;
 import stirling.software.proprietary.security.service.LoginAttemptService;
 import stirling.software.proprietary.security.service.UserService;
 
+@Slf4j
 @RequiredArgsConstructor
 public class CustomOAuth2AuthenticationSuccessHandler
         extends SavedRequestAwareAuthenticationSuccessHandler {
@@ -77,12 +79,18 @@ public class CustomOAuth2AuthenticationSuccessHandler
 
             if (user != null && !licenseSettingsService.isOAuthEligible(user)) {
                 // User is not grandfathered and no paid license - block OAuth login
+                log.warn(
+                        "OAuth login blocked for existing user '{}' - not eligible (not grandfathered and no paid license)",
+                        username);
                 response.sendRedirect(
                         request.getContextPath() + "/logout?oAuth2RequiresLicense=true");
                 return;
             }
         } else if (!licenseSettingsService.isOAuthEligible(null)) {
             // No existing user and no paid license -> block auto creation
+            log.warn(
+                    "OAuth login blocked for new user '{}' - not eligible (no paid license for auto-creation)",
+                    username);
             response.sendRedirect(request.getContextPath() + "/logout?oAuth2RequiresLicense=true");
             return;
         }

app/proprietary/src/main/java/stirling/software/proprietary/security/oauth2/OAuth2Configuration.java

@@ -67,10 +67,15 @@ public class OAuth2Configuration {
         keycloakClientRegistration().ifPresent(registrations::add);
 
         if (registrations.isEmpty()) {
-            log.error("No OAuth2 provider registered");
+            log.error("No OAuth2 provider registered - check your OAuth2 configuration");
             throw new NoProviderFoundException("At least one OAuth2 provider must be configured.");
         }
 
+        log.info(
+                "OAuth2 ClientRegistrationRepository created with {} provider(s): {}",
+                registrations.size(),
+                registrations.stream().map(ClientRegistration::getRegistrationId).toList());
+
         return new InMemoryClientRegistrationRepository(registrations);
     }
 
@@ -165,7 +170,6 @@ public class OAuth2Configuration {
                         githubClient.getUseAsUsername());
 
         boolean isValid = validateProvider(github);
-        log.info("Initialised GitHub OAuth2 provider");
 
         return isValid
                 ? Optional.of(
@@ -208,7 +212,19 @@ public class OAuth2Configuration {
                         null,
                         null);
 
-        return !isStringEmpty(oidcProvider.getIssuer()) || validateProvider(oidcProvider)
+        boolean isValid =
+                !isStringEmpty(oidcProvider.getIssuer()) || validateProvider(oidcProvider);
+        if (isValid) {
+            log.info(
+                    "Initialised OIDC OAuth2 provider: registrationId='{}', issuer='{}', redirectUri='{}'",
+                    name,
+                    oauth.getIssuer(),
+                    REDIRECT_URI_PATH + name);
+        } else {
+            log.warn("OIDC OAuth2 provider validation failed - provider will not be registered");
+        }
+
+        return isValid
                 ? Optional.of(
                         ClientRegistrations.fromIssuerLocation(oauth.getIssuer())
                                 .registrationId(name)
@@ -217,7 +233,7 @@ public class OAuth2Configuration {
                                 .scope(oidcProvider.getScopes())
                                 .userNameAttributeName(oidcProvider.getUseAsUsername().getName())
                                 .clientName(clientName)
-                                .redirectUri(REDIRECT_URI_PATH + "oidc")
+                                .redirectUri(REDIRECT_URI_PATH + name)
                                 .authorizationGrantType(AUTHORIZATION_CODE)
                                 .build())
                 : Optional.empty();

app/proprietary/src/main/java/stirling/software/proprietary/security/saml2/CustomSaml2AuthenticationSuccessHandler.java

@@ -51,6 +51,7 @@ public class CustomSaml2AuthenticationSuccessHandler
     private final JwtServiceInterface jwtService;
     private final stirling.software.proprietary.service.UserLicenseSettingsService
             licenseSettingsService;
+    private final ApplicationProperties applicationProperties;
 
     @Override
     @Audited(type = AuditEventType.USER_LOGIN, level = AuditLevel.BASIC)
@@ -67,21 +68,27 @@ public class CustomSaml2AuthenticationSuccessHandler
 
             boolean userExists = userService.usernameExistsIgnoreCase(username);
 
-            // Check if user is eligible for SAML (grandfathered or system has paid license)
+            // Check if user is eligible for SAML (grandfathered or system has ENTERPRISE license)
             if (userExists) {
                 stirling.software.proprietary.security.model.User user =
                         userService.findByUsernameIgnoreCase(username).orElse(null);
 
-                if (user != null && !licenseSettingsService.isOAuthEligible(user)) {
-                    // User is not grandfathered and no paid license - block SAML login
-                    response.sendRedirect(
-                            request.getContextPath() + "/logout?saml2RequiresLicense=true");
+                if (user != null && !licenseSettingsService.isSamlEligible(user)) {
+                    // User is not grandfathered and no ENTERPRISE license - block SAML login
+                    log.warn(
+                            "SAML2 login blocked for existing user '{}' - not eligible (not grandfathered and no ENTERPRISE license)",
+                            username);
+                    String origin = resolveOrigin(request);
+                    response.sendRedirect(origin + "/logout?saml2RequiresLicense=true");
                     return;
                 }
-            } else if (!licenseSettingsService.isOAuthEligible(null)) {
-                // No existing user and no paid license -> block auto creation
-                response.sendRedirect(
-                        request.getContextPath() + "/logout?saml2RequiresLicense=true");
+            } else if (!licenseSettingsService.isSamlEligible(null)) {
+                // No existing user and no ENTERPRISE license -> block auto creation
+                log.warn(
+                        "SAML2 login blocked for new user '{}' - not eligible (no ENTERPRISE license for auto-creation)",
+                        username);
+                String origin = resolveOrigin(request);
+                response.sendRedirect(origin + "/logout?saml2RequiresLicense=true");
                 return;
             }
 
@@ -138,20 +145,28 @@ public class CustomSaml2AuthenticationSuccessHandler
                     log.debug(
                             "User {} exists with password but is not SSO user, redirecting to logout",
                             username);
-                    response.sendRedirect(
-                            contextPath + "/logout?oAuth2AuthenticationErrorWeb=true");
+                    String origin = resolveOrigin(request);
+                    response.sendRedirect(origin + "/logout?oAuth2AuthenticationErrorWeb=true");
                     return;
                 }
 
                 try {
-                    if (!userExists || saml2Properties.getBlockRegistration()) {
-                        log.debug("Registration blocked for new user: {}", username);
-                        response.sendRedirect(
-                                contextPath + "/login?errorOAuth=oAuth2AdminBlockedUser");
+                    // Block new users only if: blockRegistration is true OR autoCreateUser is false
+                    if (!userExists
+                            && (saml2Properties.getBlockRegistration()
+                                    || !saml2Properties.getAutoCreateUser())) {
+                        log.debug(
+                                "Registration blocked for new user '{}' (blockRegistration: {}, autoCreateUser: {})",
+                                username,
+                                saml2Properties.getBlockRegistration(),
+                                saml2Properties.getAutoCreateUser());
+                        String origin = resolveOrigin(request);
+                        response.sendRedirect(origin + "/login?errorOAuth=oAuth2AdminBlockedUser");
                         return;
                     }
                     if (!userExists && licenseSettingsService.wouldExceedLimit(1)) {
-                        response.sendRedirect(contextPath + "/logout?maxUsersReached=true");
+                        String origin = resolveOrigin(request);
+                        response.sendRedirect(origin + "/logout?maxUsersReached=true");
                         return;
                     }
 
@@ -216,16 +231,30 @@ public class CustomSaml2AuthenticationSuccessHandler
             String contextPath,
             String jwt) {
         String redirectPath = resolveRedirectPath(request, contextPath);
-        String origin =
-                resolveForwardedOrigin(request)
-                        .orElseGet(
-                                () ->
-                                        resolveOriginFromReferer(request)
-                                                .orElseGet(() -> buildOriginFromRequest(request)));
+        String origin = resolveOrigin(request);
         clearRedirectCookie(response);
         return origin + redirectPath + "#access_token=" + jwt;
     }
 
+    /**
+     * Resolve the origin (frontend URL) for redirects. First checks system.frontendUrl from config,
+     * then falls back to detecting from request headers.
+     */
+    private String resolveOrigin(HttpServletRequest request) {
+        // First check if frontendUrl is configured
+        String configuredFrontendUrl = applicationProperties.getSystem().getFrontendUrl();
+        if (configuredFrontendUrl != null && !configuredFrontendUrl.trim().isEmpty()) {
+            return configuredFrontendUrl.trim();
+        }
+
+        // Fall back to auto-detection from request headers
+        return resolveForwardedOrigin(request)
+                .orElseGet(
+                        () ->
+                                resolveOriginFromReferer(request)
+                                        .orElseGet(() -> buildOriginFromRequest(request)));
+    }
+
     private String resolveRedirectPath(HttpServletRequest request, String contextPath) {
         return extractRedirectPathFromCookie(request)
                 .filter(path -> path.startsWith("/"))

app/proprietary/src/main/java/stirling/software/proprietary/security/saml2/Saml2Configuration.java

@@ -41,22 +41,74 @@ public class Saml2Configuration {
     @ConditionalOnProperty(name = "security.saml2.enabled", havingValue = "true")
     public RelyingPartyRegistrationRepository relyingPartyRegistrations() throws Exception {
         SAML2 samlConf = applicationProperties.getSecurity().getSaml2();
-        X509Certificate idpCert = CertificateUtils.readCertificate(samlConf.getIdpCert());
+
+        log.info(
+                "Initializing SAML2 configuration with registration ID: {}",
+                samlConf.getRegistrationId());
+
+        // Load IdP certificate
+        X509Certificate idpCert;
+        try {
+            Resource idpCertResource = samlConf.getIdpCert();
+            log.info("Loading IdP certificate from: {}", idpCertResource.getDescription());
+            if (!idpCertResource.exists()) {
+                log.error(
+                        "SAML2 IdP certificate not found at: {}", idpCertResource.getDescription());
+                throw new IllegalStateException(
+                        "SAML2 IdP certificate file does not exist: "
+                                + idpCertResource.getDescription());
+            }
+            idpCert = CertificateUtils.readCertificate(idpCertResource);
+            log.info(
+                    "Successfully loaded IdP certificate. Subject: {}",
+                    idpCert.getSubjectX500Principal().getName());
+        } catch (Exception e) {
+            log.error("Failed to load SAML2 IdP certificate: {}", e.getMessage(), e);
+            throw new IllegalStateException("Failed to load SAML2 IdP certificate", e);
+        }
+
         Saml2X509Credential verificationCredential = Saml2X509Credential.verification(idpCert);
+
+        // Load SP private key and certificate
         Resource privateKeyResource = samlConf.getPrivateKey();
         Resource certificateResource = samlConf.getSpCert();
-        Saml2X509Credential signingCredential =
-                new Saml2X509Credential(
-                        CertificateUtils.readPrivateKey(privateKeyResource),
-                        CertificateUtils.readCertificate(certificateResource),
-                        Saml2X509CredentialType.SIGNING);
+
+        log.info("Loading SP private key from: {}", privateKeyResource.getDescription());
+        if (!privateKeyResource.exists()) {
+            log.error("SAML2 SP private key not found at: {}", privateKeyResource.getDescription());
+            throw new IllegalStateException(
+                    "SAML2 SP private key file does not exist: "
+                            + privateKeyResource.getDescription());
+        }
+
+        log.info("Loading SP certificate from: {}", certificateResource.getDescription());
+        if (!certificateResource.exists()) {
+            log.error(
+                    "SAML2 SP certificate not found at: {}", certificateResource.getDescription());
+            throw new IllegalStateException(
+                    "SAML2 SP certificate file does not exist: "
+                            + certificateResource.getDescription());
+        }
+
+        Saml2X509Credential signingCredential;
+        try {
+            signingCredential =
+                    new Saml2X509Credential(
+                            CertificateUtils.readPrivateKey(privateKeyResource),
+                            CertificateUtils.readCertificate(certificateResource),
+                            Saml2X509CredentialType.SIGNING);
+            log.info("Successfully loaded SP credentials");
+        } catch (Exception e) {
+            log.error("Failed to load SAML2 SP credentials: {}", e.getMessage(), e);
+            throw new IllegalStateException("Failed to load SAML2 SP credentials", e);
+        }
         RelyingPartyRegistration rp =
                 RelyingPartyRegistration.withRegistrationId(samlConf.getRegistrationId())
                         .signingX509Credentials(c -> c.add(signingCredential))
                         .entityId(samlConf.getIdpIssuer())
                         .singleLogoutServiceBinding(Saml2MessageBinding.POST)
                         .singleLogoutServiceLocation(samlConf.getIdpSingleLogoutUrl())
-                        .singleLogoutServiceResponseLocation("http://localhost:8080/login")
+                        .singleLogoutServiceResponseLocation("{baseUrl}/login")
                         .assertionConsumerServiceBinding(Saml2MessageBinding.POST)
                         .assertionConsumerServiceLocation(
                                 "{baseUrl}/login/saml2/sso/{registrationId}")
@@ -75,9 +127,14 @@ public class Saml2Configuration {
                                                 .singleLogoutServiceLocation(
                                                         samlConf.getIdpSingleLogoutUrl())
                                                 .singleLogoutServiceResponseLocation(
-                                                        "http://localhost:8080/login")
+                                                        "{baseUrl}/login")
                                                 .wantAuthnRequestsSigned(true))
                         .build();
+
+        log.info(
+                "SAML2 configuration initialized successfully. Registration ID: {}, IdP: {}",
+                samlConf.getRegistrationId(),
+                samlConf.getIdpIssuer());
         return new InMemoryRelyingPartyRegistrationRepository(rp);
     }
 

app/proprietary/src/main/java/stirling/software/proprietary/security/service/EmailService.java

@@ -223,4 +223,54 @@ public class EmailService {
 
         sendPlainEmail(to, subject, body, true);
     }
+
+    @Async
+    public void sendPasswordChangedNotification(
+            String to, String username, String newPassword, String loginUrl)
+            throws MessagingException {
+        String subject = "Your Stirling PDF password has been updated";
+
+        String passwordSection =
+                newPassword == null
+                        ? ""
+                        : """
+                          <div style=\"background-color: #f8f9fa; border-left: 4px solid #007bff; padding: 15px; margin: 20px 0; border-radius: 4px;\">
+                            <p style=\"margin: 0;\"><strong>Temporary Password:</strong> %s</p>
+                          </div>
+                        """
+                                .formatted(newPassword);
+
+        String body =
+                """
+                <html><body style=\"margin: 0; padding: 0;\">
+                <div style=\"font-family: Arial, sans-serif; background-color: #f8f9fa; padding: 20px;\">
+                  <div style=\"max-width: 600px; margin: auto; background-color: #ffffff; border-radius: 8px; overflow: hidden; border: 1px solid #e0e0e0;\">
+                    <div style=\"text-align: center; padding: 20px; background-color: #222;\">
+                      <img src=\"https://raw.githubusercontent.com/Stirling-Tools/Stirling-PDF/main/docs/stirling-transparent.svg\" alt=\"Stirling PDF\" style=\"max-height: 60px;\">
+                    </div>
+                    <div style=\"padding: 30px; color: #333;\">
+                      <h2 style=\"color: #222; margin-top: 0;\">Your password was changed</h2>
+                      <p>Hello %s,</p>
+                      <p>An administrator has updated the password for your Stirling PDF account.</p>
+                      %s
+                      <p>If you did not expect this change, please contact your administrator immediately.</p>
+                      <div style=\"text-align: center; margin: 30px 0;\">
+                        <a href=\"%s\" style=\"display: inline-block; background-color: #007bff; color: #ffffff; padding: 14px 28px; text-decoration: none; border-radius: 5px; font-weight: bold;\">Go to Stirling PDF</a>
+                      </div>
+                      <p style=\"font-size: 14px; color: #666;\">Or copy and paste this link in your browser:</p>
+                      <div style=\"background-color: #f8f9fa; padding: 12px; margin: 15px 0; border-radius: 4px; word-break: break-all; font-size: 13px; color: #555;\">
+                        %s
+                      </div>
+                    </div>
+                    <div style=\"text-align: center; padding: 15px; font-size: 12px; color: #777; background-color: #f0f0f0;\">
+                      &copy; 2025 Stirling PDF. All rights reserved.
+                    </div>
+                  </div>
+                </div>
+                </body></html>
+                """
+                        .formatted(username, passwordSection, loginUrl, loginUrl);
+
+        sendPlainEmail(to, subject, body, true);
+    }
 }

app/proprietary/src/main/java/stirling/software/proprietary/service/ImageMagickLineArtConversionService.java

@@ -0,0 +1,81 @@
+package stirling.software.proprietary.service;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+import javax.imageio.ImageIO;
+
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
+import org.springframework.stereotype.Service;
+
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.common.service.LineArtConversionService;
+import stirling.software.common.util.ProcessExecutor;
+import stirling.software.common.util.ProcessExecutor.ProcessExecutorResult;
+
+@Slf4j
+@Service
+public class ImageMagickLineArtConversionService implements LineArtConversionService {
+
+    @Override
+    public PDImageXObject convertImageToLineArt(
+            PDDocument doc, PDImageXObject originalImage, double threshold, int edgeLevel)
+            throws IOException {
+
+        Path inputImage = Files.createTempFile("lineart_image_input_", ".png");
+        Path outputImage = Files.createTempFile("lineart_image_output_", ".tiff");
+
+        try {
+            ImageIO.write(originalImage.getImage(), "png", inputImage.toFile());
+
+            List<String> command = new ArrayList<>();
+            command.add("magick");
+            command.add(inputImage.toString());
+            command.add("-colorspace");
+            command.add("Gray");
+
+            // Edge-aware line art conversion using ImageMagick's built-in operators.
+            // -edge/-negate/-normalize are standard convert options (IM v6+/v7) that
+            // accentuate outlines before thresholding to a bilevel image.
+            command.add("-edge");
+            command.add(String.valueOf(edgeLevel));
+            command.add("-negate");
+            command.add("-normalize");
+
+            command.add("-type");
+            command.add("Bilevel");
+            command.add("-threshold");
+            command.add(String.format(Locale.ROOT, "%.1f%%", threshold));
+            command.add("-compress");
+            command.add("Group4");
+            command.add(outputImage.toString());
+
+            ProcessExecutorResult result =
+                    ProcessExecutor.getInstance(ProcessExecutor.Processes.IMAGEMAGICK)
+                            .runCommandWithOutputHandling(command);
+
+            if (result.getRc() != 0) {
+                log.warn(
+                        "ImageMagick line art conversion failed with return code: {}",
+                        result.getRc());
+                throw new IOException("ImageMagick line art conversion failed");
+            }
+
+            byte[] convertedBytes = Files.readAllBytes(outputImage);
+            return PDImageXObject.createFromByteArray(
+                    doc, convertedBytes, originalImage.getCOSObject().toString());
+        } catch (Exception e) {
+            log.warn("ImageMagick line art conversion failed", e);
+            throw new IOException("ImageMagick line art conversion failed", e);
+        } finally {
+            Files.deleteIfExists(inputImage);
+            Files.deleteIfExists(outputImage);
+        }
+    }
+}

app/proprietary/src/main/java/stirling/software/proprietary/service/UserLicenseSettingsService.java

@@ -21,6 +21,7 @@ import stirling.software.common.model.ApplicationProperties;
 import stirling.software.proprietary.model.UserLicenseSettings;
 import stirling.software.proprietary.security.configuration.ee.KeygenLicenseVerifier.License;
 import stirling.software.proprietary.security.configuration.ee.LicenseKeyChecker;
+import stirling.software.proprietary.security.model.User;
 import stirling.software.proprietary.security.repository.UserLicenseSettingsRepository;
 import stirling.software.proprietary.security.service.UserService;
 
@@ -176,6 +177,13 @@ public class UserLicenseSettingsService {
      */
     @Transactional
     public void grandfatherExistingOAuthUsers() {
+        // Only grandfather users if this is a V1→V2 upgrade, not a fresh V2 install
+        Boolean isNewServer = applicationProperties.getAutomaticallyGenerated().getIsNewServer();
+        if (Boolean.TRUE.equals(isNewServer)) {
+            log.info("Fresh V2 installation detected - skipping OAuth user grandfathering");
+            return;
+        }
+
         UserLicenseSettings settings = getOrCreateSettings();
 
         // Check if we've already run this migration
@@ -343,17 +351,65 @@ public class UserLicenseSettingsService {
      * @param user The user to check
      * @return true if the user can use OAuth/SAML
      */
-    public boolean isOAuthEligible(stirling.software.proprietary.security.model.User user) {
-        // Grandfathered users always have OAuth access
-        if (user != null && user.isOauthGrandfathered()) {
-            log.debug("User {} is grandfathered for OAuth", user.getUsername());
+    public boolean isOAuthEligible(User user) {
+        String username = (user != null) ? user.getUsername() : "<new user>";
+        log.info("OAuth eligibility check for user: {}", username);
+
+        // Check license first - if paying, they're eligible (no need to check grandfathering)
+        boolean hasPaid = hasPaidLicense();
+        if (hasPaid) {
+            log.debug("User {} eligible for OAuth via paid license", username);
             return true;
         }
 
-        // Users can use OAuth/SAML only if system has ENTERPRISE license
-        boolean hasEnterpriseLicense = hasEnterpriseLicense();
-        log.debug("OAuth eligibility check: hasEnterpriseLicense={}", hasEnterpriseLicense);
-        return hasEnterpriseLicense;
+        // No license - check if grandfathered (fallback for V1 users)
+        if (user != null && user.isOauthGrandfathered()) {
+            log.info("User {} eligible for OAuth via grandfathering (no paid license)", username);
+            return true;
+        }
+
+        // Not grandfathered and no license
+        log.info("User {} NOT eligible for OAuth: no paid license and not grandfathered", username);
+        return false;
+    }
+
+    /**
+     * Checks if a user is eligible to use SAML authentication.
+     *
+     * <p>A user is eligible if:
+     *
+     * <ul>
+     *   <li>They are grandfathered for OAuth (existing user before policy change), OR
+     *   <li>The system has an ENTERPRISE license (SAML is enterprise-only)
+     * </ul>
+     *
+     * @param user The user to check
+     * @return true if the user can use SAML
+     */
+    public boolean isSamlEligible(User user) {
+        String username = (user != null) ? user.getUsername() : "<new user>";
+        log.info("SAML2 eligibility check for user: {}", username);
+
+        // Check license first - if paying, they're eligible (no need to check grandfathering)
+        boolean hasEnterprise = hasEnterpriseLicense();
+        if (hasEnterprise) {
+            log.debug("User {} eligible for SAML2 via ENTERPRISE license", username);
+            return true;
+        }
+
+        // No license - check if grandfathered (fallback for V1 users)
+        if (user != null && user.isOauthGrandfathered()) {
+            log.info(
+                    "User {} eligible for SAML2 via grandfathering (no ENTERPRISE license)",
+                    username);
+            return true;
+        }
+
+        // Not grandfathered and no license
+        log.info(
+                "User {} NOT eligible for SAML2: no ENTERPRISE license and not grandfathered",
+                username);
+        return false;
     }
 
     /**
@@ -495,8 +551,12 @@ public class UserLicenseSettingsService {
         if (checker == null) {
             return false;
         }
+
         License license = checker.getPremiumLicenseEnabledResult();
-        return license == License.SERVER || license == License.ENTERPRISE;
+        boolean hasPaid = (license == License.SERVER || license == License.ENTERPRISE);
+        log.info("License check result: type={}, requiresPaid=true, hasPaid={}", license, hasPaid);
+
+        return hasPaid;
     }
 
     /**
@@ -510,7 +570,19 @@ public class UserLicenseSettingsService {
         if (checker == null) {
             return false;
         }
+
         License license = checker.getPremiumLicenseEnabledResult();
+        log.info(
+                "License check result: type={}, requiresEnterprise=true, hasEnterprise={}",
+                license,
+                (license == License.ENTERPRISE));
+
+        if (license != License.ENTERPRISE) {
+            log.warn(
+                    "SAML2 requires ENTERPRISE license but found: {}. SAML2 login will be blocked.",
+                    license);
+        }
+
         return license == License.ENTERPRISE;
     }
 }

app/proprietary/src/test/java/stirling/software/proprietary/security/oauth2/OAuth2ConfigurationTest.java

@@ -0,0 +1,162 @@
+package stirling.software.proprietary.security.oauth2;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Unit tests for OAuth2Configuration redirect URI logic.
+ *
+ * <p>These tests validate the critical fix for GitHub issue #5141: The redirect URI path segment
+ * MUST match the registration ID. Previously, the redirect URI was hardcoded to 'oidc', causing
+ * InvalidClientRegistrationIdException when custom provider names were used.
+ *
+ * <p>Note: These are conceptual tests documenting the expected behavior. Full integration testing
+ * with actual OIDC discovery would require: 1. Mock HTTP server for OIDC discovery endpoints 2.
+ * Valid OIDC configuration responses 3. Network mocking infrastructure
+ */
+class OAuth2ConfigurationTest {
+
+    /**
+     * Tests the redirect URI pattern for OIDC provider configurations.
+     *
+     * <p>Critical behavior (GitHub issue #5141 fix): The redirect URI path segment MUST match the
+     * registration ID. For example: - Provider name: "authentik" → Redirect URI:
+     * "/login/oauth2/code/authentik" - Provider name: "mycompany" → Redirect URI:
+     * "/login/oauth2/code/mycompany" - Provider name: "oidc" → Redirect URI:
+     * "/login/oauth2/code/oidc"
+     *
+     * <p>Previously, the redirect URI was hardcoded to 'oidc', causing Spring Security to look for
+     * a registration with ID 'oidc' when the provider redirected back. This caused
+     * InvalidClientRegistrationIdException when custom provider names were used.
+     */
+    @Test
+    void testRedirectUriPattern_usesProviderNameNotHardcodedOidc() {
+        // Verify the redirect URI pattern constant
+        String redirectUriBase = "{baseUrl}/login/oauth2/code/";
+
+        // Test cases: provider name → expected redirect URI
+        String[][] testCases = {
+            {"authentik", redirectUriBase + "authentik"},
+            {"mycompany", redirectUriBase + "mycompany"},
+            {"oidc", redirectUriBase + "oidc"},
+            {"okta", redirectUriBase + "okta"},
+            {"auth0", redirectUriBase + "auth0"}
+        };
+
+        for (String[] testCase : testCases) {
+            String providerName = testCase[0];
+            String expectedRedirectUri = testCase[1];
+
+            // The fix ensures: .redirectUri(REDIRECT_URI_PATH + name)
+            // instead of: .redirectUri(REDIRECT_URI_PATH + "oidc")
+            String actualRedirectUri = redirectUriBase + providerName;
+
+            assertEquals(
+                    expectedRedirectUri,
+                    actualRedirectUri,
+                    String.format(
+                            "Redirect URI for provider '%s' must use provider name, not hardcoded 'oidc'",
+                            providerName));
+        }
+    }
+
+    /**
+     * Documents the critical fix for OAuth2 redirect URI mismatch.
+     *
+     * <p>This test validates the logic that was changed in OAuth2Configuration.java line 220:
+     *
+     * <pre>
+     * // BEFORE (bug):
+     * .redirectUri(REDIRECT_URI_PATH + "oidc")  // Always "oidc"
+     *
+     * // AFTER (fix):
+     * .redirectUri(REDIRECT_URI_PATH + name)  // Dynamic provider name
+     * </pre>
+     */
+    @Test
+    void testCriticalFix_redirectUriMatchesRegistrationId() {
+        // The redirect URI path segment extraction by Spring Security
+        String callbackUrl = "http://localhost:8080/login/oauth2/code/authentik?code=abc123";
+
+        // Spring extracts the path segment between "code/" and "?"
+        String extractedRegistrationId = extractRegistrationIdFromCallback(callbackUrl);
+
+        // The extracted ID MUST match an actual registration ID
+        assertEquals("authentik", extractedRegistrationId);
+
+        // If we had used hardcoded "oidc", the callback would be:
+        String buggyCallbackUrl = "http://localhost:8080/login/oauth2/code/oidc?code=abc123";
+        String buggyExtractedId = extractRegistrationIdFromCallback(buggyCallbackUrl);
+
+        // This would look for registration with ID "oidc" but we registered "authentik"
+        assertEquals("oidc", buggyExtractedId);
+
+        // The mismatch: registrationId="authentik", but Spring looks for "oidc"
+        // Result: InvalidClientRegistrationIdException
+        assertNotNull(buggyExtractedId, "This demonstrates the bug that was fixed");
+    }
+
+    /** Helper method simulating Spring's extraction of registration ID from callback URL */
+    private String extractRegistrationIdFromCallback(String callbackUrl) {
+        // Simplified version of what Spring Security does
+        // Actual: OAuth2AuthorizationRequestRedirectFilter extracts from path
+        String path = callbackUrl.split("\\?")[0];
+        String[] parts = path.split("/");
+        return parts[parts.length - 1]; // Last path segment
+    }
+
+    /**
+     * Validates the frontend-backend flow for custom provider names.
+     *
+     * <p>Complete flow: 1. Backend: Provider configured as "authentik" in settings.yml 2. Backend:
+     * ClientRegistration created with registrationId="authentik" 3. Backend: Redirect URI set to
+     * "{baseUrl}/login/oauth2/code/authentik" 4. Backend: Login endpoint returns providerList with
+     * "/oauth2/authorization/authentik" 5. Frontend: Extracts "authentik" from path and uses it for
+     * OAuth login 6. Frontend: Redirects to "/oauth2/authorization/authentik" 7. Backend: Spring
+     * Security redirects to provider with redirect_uri containing "authentik" 8. Provider:
+     * Redirects back to "/login/oauth2/code/authentik?code=..." 9. Backend: Spring Security
+     * extracts "authentik" from callback URL 10. Backend: Looks up ClientRegistration with ID
+     * "authentik" ✅ SUCCESS
+     *
+     * <p>If redirect URI was hardcoded to "oidc" (the bug): Step 7: Provider redirects to
+     * "/login/oauth2/code/oidc?code=..." Step 9: Spring Security looks for registration ID "oidc"
+     * Step 10: FAIL - No registration found with ID "oidc" (we registered "authentik") Result:
+     * InvalidClientRegistrationIdException
+     */
+    @Test
+    void testEndToEndFlow_registrationIdConsistency() {
+        String providerName = "authentik";
+
+        // Step 2: Registration ID
+        String registrationId = providerName;
+        assertEquals("authentik", registrationId);
+
+        // Step 3: Redirect URI (MUST use same name)
+        String redirectUri = "{baseUrl}/login/oauth2/code/" + providerName;
+        assertEquals("{baseUrl}/login/oauth2/code/authentik", redirectUri);
+
+        // Step 4: Provider list endpoint
+        String authorizationPath = "/oauth2/authorization/" + providerName;
+        assertEquals("/oauth2/authorization/authentik", authorizationPath);
+
+        // Step 5: Frontend extracts provider ID
+        String frontendProviderId =
+                authorizationPath.substring(authorizationPath.lastIndexOf('/') + 1);
+        assertEquals("authentik", frontendProviderId);
+
+        // Step 6-8: OAuth flow (external)
+
+        // Step 9: Callback URL from provider
+        String callbackUrl =
+                "http://localhost:8080/login/oauth2/code/" + providerName + "?code=abc123";
+        String extractedId = extractRegistrationIdFromCallback(callbackUrl);
+
+        // Step 10: Registration lookup
+        assertEquals(
+                registrationId,
+                extractedId,
+                "Registration ID from callback MUST match original registration ID");
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/security/service/MailConfigTest.java

@@ -27,6 +27,11 @@ class MailConfigTest {
         when(mailProps.getPort()).thenReturn(587);
         when(mailProps.getUsername()).thenReturn("user@example.com");
         when(mailProps.getPassword()).thenReturn("password");
+        when(mailProps.getStartTlsEnable()).thenReturn(null);
+        when(mailProps.getStartTlsRequired()).thenReturn(null);
+        when(mailProps.getSslEnable()).thenReturn(null);
+        when(mailProps.getSslTrust()).thenReturn(null);
+        when(mailProps.getSslCheckServerIdentity()).thenReturn(null);
     }
 
     @Test
@@ -50,6 +55,32 @@ class MailConfigTest {
                 () -> assertEquals("password", impl.getPassword()),
                 () -> assertEquals("UTF-8", impl.getDefaultEncoding()),
                 () -> assertEquals("true", props.getProperty("mail.smtp.auth")),
-                () -> assertEquals("true", props.getProperty("mail.smtp.starttls.enable")));
+                () -> assertEquals("true", props.getProperty("mail.smtp.starttls.enable")),
+                () -> assertEquals(null, props.getProperty("mail.smtp.starttls.required")),
+                () -> assertEquals(null, props.getProperty("mail.smtp.ssl.enable")),
+                () -> assertEquals("*", props.getProperty("mail.smtp.ssl.trust")));
+    }
+
+    @Test
+    void shouldRespectExplicitTlsOverrides() {
+        ApplicationProperties appProps = mock(ApplicationProperties.class);
+        when(mailProps.getStartTlsEnable()).thenReturn(false);
+        when(mailProps.getStartTlsRequired()).thenReturn(true);
+        when(mailProps.getSslEnable()).thenReturn(true);
+        when(mailProps.getSslTrust()).thenReturn("*");
+        when(mailProps.getSslCheckServerIdentity()).thenReturn(true);
+        when(appProps.getMail()).thenReturn(mailProps);
+
+        MailConfig config = new MailConfig(appProps);
+        JavaMailSenderImpl impl = (JavaMailSenderImpl) config.javaMailSender();
+
+        Properties props = impl.getJavaMailProperties();
+
+        assertAll(
+                () -> assertEquals("false", props.getProperty("mail.smtp.starttls.enable")),
+                () -> assertEquals("true", props.getProperty("mail.smtp.starttls.required")),
+                () -> assertEquals("true", props.getProperty("mail.smtp.ssl.enable")),
+                () -> assertEquals("*", props.getProperty("mail.smtp.ssl.trust")),
+                () -> assertEquals("true", props.getProperty("mail.smtp.ssl.checkserveridentity")));
     }
 }

app/proprietary/src/test/java/stirling/software/proprietary/service/UserLicenseSettingsServiceTest.java

@@ -33,6 +33,7 @@ class UserLicenseSettingsServiceTest {
     @Mock private UserService userService;
     @Mock private ApplicationProperties applicationProperties;
     @Mock private ApplicationProperties.Premium premium;
+    @Mock private ApplicationProperties.AutomaticallyGenerated automaticallyGenerated;
     @Mock private LicenseKeyChecker licenseKeyChecker;
     @Mock private ObjectProvider<LicenseKeyChecker> licenseKeyCheckerProvider;
 
@@ -49,6 +50,8 @@ class UserLicenseSettingsServiceTest {
         mockSettings.setGrandfatheredUserSignature("80:test-signature");
 
         when(applicationProperties.getPremium()).thenReturn(premium);
+        when(applicationProperties.getAutomaticallyGenerated()).thenReturn(automaticallyGenerated);
+        when(automaticallyGenerated.getIsNewServer()).thenReturn(false); // Default: not a new server
         when(settingsRepository.findSettings()).thenReturn(Optional.of(mockSettings));
         when(userService.getTotalUsersCount()).thenReturn(80L);
         when(settingsRepository.save(any(UserLicenseSettings.class)))
@@ -267,4 +270,222 @@ class UserLicenseSettingsServiceTest {
         verify(userService, times(1)).grandfatherAllOAuthUsers();
         verify(userService, times(1)).grandfatherPendingSsoUsersWithoutSession();
     }
+
+    // ===== OAuth Eligibility Tests =====
+
+    @Test
+    void isOAuthEligible_grandfatheredUser_returnsTrue() {
+        // Grandfathered user should be eligible regardless of license
+        stirling.software.proprietary.security.model.User user =
+                new stirling.software.proprietary.security.model.User();
+        user.setUsername("grandfathered-user");
+        user.setOauthGrandfathered(true);
+
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.NORMAL);
+
+        boolean result = service.isOAuthEligible(user);
+
+        assertEquals(true, result, "Grandfathered user should be eligible for OAuth");
+    }
+
+    @Test
+    void isOAuthEligible_nonGrandfatheredUserWithServerLicense_returnsTrue() {
+        // Non-grandfathered user with SERVER license should be eligible
+        stirling.software.proprietary.security.model.User user =
+                new stirling.software.proprietary.security.model.User();
+        user.setUsername("test-user");
+        user.setOauthGrandfathered(false);
+
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.SERVER);
+
+        boolean result = service.isOAuthEligible(user);
+
+        assertEquals(true, result, "Non-grandfathered user with SERVER license should be eligible");
+    }
+
+    @Test
+    void isOAuthEligible_nonGrandfatheredUserWithEnterpriseLicense_returnsTrue() {
+        // Non-grandfathered user with ENTERPRISE license should be eligible
+        stirling.software.proprietary.security.model.User user =
+                new stirling.software.proprietary.security.model.User();
+        user.setUsername("test-user");
+        user.setOauthGrandfathered(false);
+
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.ENTERPRISE);
+
+        boolean result = service.isOAuthEligible(user);
+
+        assertEquals(
+                true, result, "Non-grandfathered user with ENTERPRISE license should be eligible");
+    }
+
+    @Test
+    void isOAuthEligible_nonGrandfatheredUserWithNoLicense_returnsFalse() {
+        // Non-grandfathered user without license should NOT be eligible
+        stirling.software.proprietary.security.model.User user =
+                new stirling.software.proprietary.security.model.User();
+        user.setUsername("test-user");
+        user.setOauthGrandfathered(false);
+
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.NORMAL);
+
+        boolean result = service.isOAuthEligible(user);
+
+        assertEquals(
+                false,
+                result,
+                "Non-grandfathered user without paid license should NOT be eligible");
+    }
+
+    @Test
+    void isOAuthEligible_newUserWithServerLicense_returnsTrue() {
+        // New user (null) with SERVER license should be eligible for auto-creation
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.SERVER);
+
+        boolean result = service.isOAuthEligible(null);
+
+        assertEquals(
+                true, result, "New user with SERVER license should be eligible for auto-creation");
+    }
+
+    @Test
+    void isOAuthEligible_newUserWithNoLicense_returnsFalse() {
+        // New user (null) without license should NOT be eligible
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.NORMAL);
+
+        boolean result = service.isOAuthEligible(null);
+
+        assertEquals(
+                false,
+                result,
+                "New user without paid license should NOT be eligible for auto-creation");
+    }
+
+    @Test
+    void isOAuthEligible_licenseCheckerUnavailable_returnsFalse() {
+        // If LicenseKeyChecker is unavailable, OAuth should be blocked
+        when(licenseKeyCheckerProvider.getIfAvailable()).thenReturn(null);
+
+        stirling.software.proprietary.security.model.User user =
+                new stirling.software.proprietary.security.model.User();
+        user.setUsername("test-user");
+        user.setOauthGrandfathered(false);
+
+        boolean result = service.isOAuthEligible(user);
+
+        assertEquals(
+                false, result, "OAuth should be blocked when LicenseKeyChecker is unavailable");
+    }
+
+    // ===== SAML Eligibility Tests =====
+
+    @Test
+    void isSamlEligible_grandfatheredUser_returnsTrue() {
+        // Grandfathered user should be eligible for SAML regardless of license
+        stirling.software.proprietary.security.model.User user =
+                new stirling.software.proprietary.security.model.User();
+        user.setUsername("grandfathered-user");
+        user.setOauthGrandfathered(true);
+
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.NORMAL);
+
+        boolean result = service.isSamlEligible(user);
+
+        assertEquals(true, result, "Grandfathered user should be eligible for SAML");
+    }
+
+    @Test
+    void isSamlEligible_nonGrandfatheredUserWithEnterpriseLicense_returnsTrue() {
+        // Non-grandfathered user with ENTERPRISE license should be eligible
+        stirling.software.proprietary.security.model.User user =
+                new stirling.software.proprietary.security.model.User();
+        user.setUsername("test-user");
+        user.setOauthGrandfathered(false);
+
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.ENTERPRISE);
+
+        boolean result = service.isSamlEligible(user);
+
+        assertEquals(
+                true,
+                result,
+                "Non-grandfathered user with ENTERPRISE license should be eligible for SAML");
+    }
+
+    @Test
+    void isSamlEligible_nonGrandfatheredUserWithServerLicense_returnsFalse() {
+        // Non-grandfathered user with SERVER license should NOT be eligible for SAML
+        stirling.software.proprietary.security.model.User user =
+                new stirling.software.proprietary.security.model.User();
+        user.setUsername("test-user");
+        user.setOauthGrandfathered(false);
+
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.SERVER);
+
+        boolean result = service.isSamlEligible(user);
+
+        assertEquals(
+                false,
+                result,
+                "Non-grandfathered user with SERVER license should NOT be eligible for SAML");
+    }
+
+    @Test
+    void isSamlEligible_nonGrandfatheredUserWithNoLicense_returnsFalse() {
+        // Non-grandfathered user without license should NOT be eligible
+        stirling.software.proprietary.security.model.User user =
+                new stirling.software.proprietary.security.model.User();
+        user.setUsername("test-user");
+        user.setOauthGrandfathered(false);
+
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.NORMAL);
+
+        boolean result = service.isSamlEligible(user);
+
+        assertEquals(
+                false,
+                result,
+                "Non-grandfathered user without ENTERPRISE license should NOT be eligible for SAML");
+    }
+
+    @Test
+    void isSamlEligible_newUserWithEnterpriseLicense_returnsTrue() {
+        // New user (null) with ENTERPRISE license should be eligible for auto-creation
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.ENTERPRISE);
+
+        boolean result = service.isSamlEligible(null);
+
+        assertEquals(
+                true,
+                result,
+                "New user with ENTERPRISE license should be eligible for SAML auto-creation");
+    }
+
+    @Test
+    void isSamlEligible_newUserWithServerLicense_returnsFalse() {
+        // New user (null) with SERVER license should NOT be eligible for SAML
+        when(licenseKeyChecker.getPremiumLicenseEnabledResult()).thenReturn(License.SERVER);
+
+        boolean result = service.isSamlEligible(null);
+
+        assertEquals(
+                false,
+                result,
+                "New user with SERVER license should NOT be eligible for SAML (requires ENTERPRISE)");
+    }
+
+    @Test
+    void isSamlEligible_licenseCheckerUnavailable_returnsFalse() {
+        // If LicenseKeyChecker is unavailable, SAML should be blocked
+        when(licenseKeyCheckerProvider.getIfAvailable()).thenReturn(null);
+
+        stirling.software.proprietary.security.model.User user =
+                new stirling.software.proprietary.security.model.User();
+        user.setUsername("test-user");
+        user.setOauthGrandfathered(false);
+
+        boolean result = service.isSamlEligible(user);
+
+        assertEquals(false, result, "SAML should be blocked when LicenseKeyChecker is unavailable");
+    }
 }

build.gradle

@@ -12,6 +12,8 @@ plugins {
 }
 
 import com.github.jk1.license.render.*
+import groovy.json.JsonOutput
+import groovy.json.JsonSlurper
 
 ext {
     springBootVersion = "3.5.6"
@@ -57,7 +59,7 @@ repositories {
 
 allprojects {
     group = 'stirling.software'
-    version = '2.0.3'
+    version = '2.1.4'
 
     configurations.configureEach {
         exclude group: 'commons-logging', module: 'commons-logging'
@@ -65,6 +67,51 @@ allprojects {
     }
 }
 
+def writeIfChanged(File targetFile, String newContent) {
+    if (targetFile.getText('UTF-8') != newContent) {
+        targetFile.write(newContent, 'UTF-8')
+    }
+}
+
+def updateTauriConfigVersion(String version) {
+    File tauriConfig = file('frontend/src-tauri/tauri.conf.json')
+    def parsed = new JsonSlurper().parse(tauriConfig)
+    parsed.version = version
+
+    def formatted = JsonOutput.prettyPrint(JsonOutput.toJson(parsed)) + System.lineSeparator()
+    writeIfChanged(tauriConfig, formatted)
+}
+
+def updateSimulationVersion(File fileToUpdate, String version) {
+    def content = fileToUpdate.getText('UTF-8')
+    def matcher = content =~ /(appVersion:\s*')([^']*)(')/
+
+    if (!matcher.find()) {
+        throw new GradleException("Could not locate appVersion in ${fileToUpdate} for synchronization")
+    }
+
+    def updatedContent = matcher.replaceFirst("${matcher.group(1)}${version}${matcher.group(3)}")
+    writeIfChanged(fileToUpdate, updatedContent)
+}
+
+tasks.register('syncAppVersion') {
+    group = 'versioning'
+    description = 'Synchronizes app version across desktop and simulation configs.'
+
+    doLast {
+        def appVersion = project.version.toString()
+        println "Synchronizing application version to ${appVersion}"
+        updateTauriConfigVersion(appVersion)
+
+        [
+            'frontend/src/core/testing/serverExperienceSimulations.ts',
+            'frontend/src/proprietary/testing/serverExperienceSimulations.ts'
+        ].each { path ->
+            updateSimulationVersion(file(path), appVersion)
+        }
+    }
+}
+
 tasks.register('writeVersion', WriteProperties) {
     destinationFile = layout.projectDirectory.file('app/common/src/main/resources/version.properties')
     println "Writing version.properties to ${destinationFile.get().asFile.path}"
@@ -314,7 +361,7 @@ tasks.named('bootRun') {
 tasks.named('build') {
     group = 'build'
     description = 'Delegates to :stirling-pdf:bootJar'
-    dependsOn ':stirling-pdf:bootJar', 'buildRestartHelper'
+    dependsOn ':stirling-pdf:bootJar', 'buildRestartHelper', 'syncAppVersion'
 
     doFirst {
         println "Delegating to :stirling-pdf:bootJar"