diff --git a/src/main/constants.ts b/src/main/constants.ts
index 12dcf4e..9e84362 100644
--- a/src/main/constants.ts
+++ b/src/main/constants.ts
@@ -50,6 +50,8 @@ export function defaultSettings(): AppSettings {
     autoExtract: true,
     autoRename4sf4sj: false,
     extractDir: path.join(baseDir, "_entpackt"),
+    collectMkvToLibrary: false,
+    mkvLibraryDir: path.join(baseDir, "_mkv"),
     createExtractSubfolder: true,
     hybridExtract: true,
     cleanupMode: "none",
diff --git a/src/main/download-manager.ts b/src/main/download-manager.ts
index 2bf3be5..865b782 100644
--- a/src/main/download-manager.ts
+++ b/src/main/download-manager.ts
@@ -1457,8 +1457,19 @@ export class DownloadManager extends EventEmitter {
     return removed;
   }
 
-  private collectVideoFiles(rootDir: string): string[] {
-    if (!rootDir || !fs.existsSync(rootDir)) {
+  private collectFilesByExtensions(rootDir: string, extensions: Set<string>): string[] {
+    if (!rootDir || !fs.existsSync(rootDir) || extensions.size === 0) {
+      return [];
+    }
+
+    const normalizedExtensions = new Set<string>();
+    for (const extension of extensions) {
+      const normalized = String(extension || "").trim().toLowerCase();
+      if (normalized) {
+        normalizedExtensions.add(normalized);
+      }
+    }
+    if (normalizedExtensions.size === 0) {
       return [];
     }
 
@@ -1483,7 +1494,7 @@ export class DownloadManager extends EventEmitter {
           continue;
         }
         const extension = path.extname(entry.name).toLowerCase();
-        if (!SAMPLE_VIDEO_EXTENSIONS.has(extension)) {
+        if (!normalizedExtensions.has(extension)) {
           continue;
         }
         files.push(fullPath);
@@ -1493,6 +1504,10 @@ export class DownloadManager extends EventEmitter {
     return files;
   }
 
+  private collectVideoFiles(rootDir: string): string[] {
+    return this.collectFilesByExtensions(rootDir, SAMPLE_VIDEO_EXTENSIONS);
+  }
+
   private buildSafeAutoRenameTargetPath(sourcePath: string, targetBaseName: string, sourceExt: string): string | null {
     const dirPath = path.dirname(sourcePath);
     const safeBaseName = sanitizeFilename(String(targetBaseName || "").trim());
@@ -1662,6 +1677,112 @@ export class DownloadManager extends EventEmitter {
     return renamed;
   }
 
+  private moveFileWithExdevFallback(sourcePath: string, targetPath: string): void {
+    try {
+      fs.renameSync(sourcePath, targetPath);
+      return;
+    } catch (error) {
+      const code = error && typeof error === "object" && "code" in error
+        ? String((error as NodeJS.ErrnoException).code || "")
+        : "";
+      if (code !== "EXDEV") {
+        throw error;
+      }
+    }
+
+    fs.copyFileSync(sourcePath, targetPath);
+    fs.rmSync(sourcePath, { force: true });
+  }
+
+  private buildUniqueFlattenTargetPath(targetDir: string, sourcePath: string, reserved: Set<string>): string {
+    const parsed = path.parse(path.basename(sourcePath));
+    const extension = parsed.ext || ".mkv";
+    const baseName = sanitizeFilename(parsed.name || "video");
+
+    let index = 1;
+    while (true) {
+      const candidateName = index <= 1
+        ? `${baseName}${extension}`
+        : `${baseName} (${index})${extension}`;
+      const candidatePath = path.join(targetDir, candidateName);
+      const candidateKey = pathKey(candidatePath);
+      if (reserved.has(candidateKey)) {
+        index += 1;
+        continue;
+      }
+      if (!fs.existsSync(candidatePath)) {
+        reserved.add(candidateKey);
+        return candidatePath;
+      }
+      index += 1;
+    }
+  }
+
+  private collectMkvFilesToLibrary(packageId: string, pkg: PackageEntry): void {
+    if (!this.settings.collectMkvToLibrary) {
+      return;
+    }
+
+    const sourceDir = this.settings.autoExtract ? pkg.extractDir : pkg.outputDir;
+    const targetDirRaw = String(this.settings.mkvLibraryDir || "").trim();
+    if (!sourceDir || !targetDirRaw) {
+      logger.warn(`MKV-Sammelordner übersprungen: pkg=${pkg.name}, ungültiger Pfad`);
+      return;
+    }
+    const targetDir = path.resolve(targetDirRaw);
+    if (!fs.existsSync(sourceDir)) {
+      logger.info(`MKV-Sammelordner: pkg=${pkg.name}, Quelle fehlt (${sourceDir})`);
+      return;
+    }
+
+    try {
+      fs.mkdirSync(targetDir, { recursive: true });
+    } catch (error) {
+      logger.warn(`MKV-Sammelordner konnte nicht erstellt werden: pkg=${pkg.name}, dir=${targetDir}, reason=${compactErrorText(error)}`);
+      return;
+    }
+
+    const mkvFiles = this.collectFilesByExtensions(sourceDir, new Set([".mkv"]));
+    if (mkvFiles.length === 0) {
+      logger.info(`MKV-Sammelordner: pkg=${pkg.name}, keine MKV gefunden`);
+      return;
+    }
+
+    const reservedTargets = new Set<string>();
+    let moved = 0;
+    let skipped = 0;
+    let failed = 0;
+
+    for (const sourcePath of mkvFiles) {
+      if (isPathInsideDir(sourcePath, targetDir)) {
+        skipped += 1;
+        continue;
+      }
+      const targetPath = this.buildUniqueFlattenTargetPath(targetDir, sourcePath, reservedTargets);
+      if (pathKey(sourcePath) === pathKey(targetPath)) {
+        skipped += 1;
+        continue;
+      }
+
+      try {
+        this.moveFileWithExdevFallback(sourcePath, targetPath);
+        moved += 1;
+      } catch (error) {
+        failed += 1;
+        logger.warn(`MKV verschieben fehlgeschlagen: ${sourcePath} -> ${targetPath} (${compactErrorText(error)})`);
+      }
+    }
+
+    if (moved > 0 && fs.existsSync(sourceDir)) {
+      const removedDirs = this.removeEmptyDirectoryTree(sourceDir);
+      if (removedDirs > 0) {
+        logger.info(`MKV-Sammelordner entfernte leere Ordner: pkg=${pkg.name}, entfernt=${removedDirs}`);
+      }
+    }
+
+    logger.info(`MKV-Sammelordner: pkg=${pkg.name}, packageId=${packageId}, moved=${moved}, skipped=${skipped}, failed=${failed}, target=${targetDir}`);
+  }
+
   public cancelPackage(packageId: string): void {
     const pkg = this.session.packages[packageId];
     if (!pkg) {
@@ -4152,6 +4273,9 @@ export class DownloadManager extends EventEmitter {
     } else {
       pkg.status = "completed";
     }
+    if (pkg.status === "completed") {
+      this.collectMkvFilesToLibrary(packageId, pkg);
+    }
     if (this.runPackageIds.has(packageId)) {
       if (pkg.status === "completed") {
         this.runCompletedPackages.add(packageId);
diff --git a/src/main/storage.ts b/src/main/storage.ts
index d3e9b3d..7142ddf 100644
--- a/src/main/storage.ts
+++ b/src/main/storage.ts
@@ -84,6 +84,8 @@ export function normalizeSettings(settings: AppSettings): AppSettings {
     autoExtract: Boolean(settings.autoExtract),
     autoRename4sf4sj: Boolean(settings.autoRename4sf4sj),
     extractDir: normalizeAbsoluteDir(settings.extractDir, defaults.extractDir),
+    collectMkvToLibrary: Boolean(settings.collectMkvToLibrary),
+    mkvLibraryDir: normalizeAbsoluteDir(settings.mkvLibraryDir, defaults.mkvLibraryDir),
     createExtractSubfolder: Boolean(settings.createExtractSubfolder),
     hybridExtract: Boolean(settings.hybridExtract),
     cleanupMode: settings.cleanupMode,
diff --git a/src/renderer/App.tsx b/src/renderer/App.tsx
index 6cce6d6..1db39aa 100644
--- a/src/renderer/App.tsx
+++ b/src/renderer/App.tsx
@@ -48,6 +48,7 @@ const emptySnapshot = (): UiSnapshot => ({
     rememberToken: true, providerPrimary: "realdebrid", providerSecondary: "megadebrid",
     providerTertiary: "bestdebrid", autoProviderFallback: true, outputDir: "", packageName: "",
     autoExtract: true, autoRename4sf4sj: false, extractDir: "", createExtractSubfolder: true, hybridExtract: true,
+    collectMkvToLibrary: false, mkvLibraryDir: "",
     cleanupMode: "none", extractConflictMode: "overwrite", removeLinkFilesAfterExtract: false,
     removeSamplesAfterExtract: false, enableIntegrityCheck: true, autoResumeOnStart: true,
     autoReconnect: false, reconnectWaitSeconds: 45, completedCleanupPolicy: "never",
@@ -1412,6 +1413,23 @@ export function App(): ReactElement {
                 <label className="toggle-line"><input type="checkbox" checked={settingsDraft.autoRename4sf4sj} onChange={(e) => setBool("autoRename4sf4sj", e.target.checked)} /> Auto-Rename (4SF/4SJ)</label>
                 <label className="toggle-line"><input type="checkbox" checked={settingsDraft.createExtractSubfolder} onChange={(e) => setBool("createExtractSubfolder", e.target.checked)} /> Entpackte Dateien in Paket-Unterordner speichern</label>
                 <label className="toggle-line"><input type="checkbox" checked={settingsDraft.hybridExtract} onChange={(e) => setBool("hybridExtract", e.target.checked)} /> Hybrid-Extract</label>
+                <label className="toggle-line"><input type="checkbox" checked={settingsDraft.collectMkvToLibrary} onChange={(e) => setBool("collectMkvToLibrary", e.target.checked)} /> MKV nach Paketabschluss in Sammelordner verschieben (flach)</label>
+                <label>MKV-Sammelordner</label>
+                <div className="input-row">
+                  <input value={settingsDraft.mkvLibraryDir} onChange={(e) => setText("mkvLibraryDir", e.target.value)} disabled={!settingsDraft.collectMkvToLibrary} />
+                  <button
+                    className="btn"
+                    disabled={!settingsDraft.collectMkvToLibrary}
+                    onClick={() => {
+                      void performQuickAction(async () => {
+                        const s = await window.rd.pickFolder();
+                        if (s) { setText("mkvLibraryDir", s); }
+                      });
+                    }}
+                  >
+                    Wählen
+                  </button>
+                </div>
                 <label>Passwortliste (eine Zeile pro Passwort)</label>
                 <textarea
                   className="password-list"
diff --git a/src/shared/types.ts b/src/shared/types.ts
index 333d4c6..203fe51 100644
--- a/src/shared/types.ts
+++ b/src/shared/types.ts
@@ -50,6 +50,8 @@ export interface AppSettings {
   autoExtract: boolean;
   autoRename4sf4sj: boolean;
   extractDir: string;
+  collectMkvToLibrary: boolean;
+  mkvLibraryDir: string;
   createExtractSubfolder: boolean;
   hybridExtract: boolean;
   cleanupMode: CleanupMode;
diff --git a/tests/download-manager.test.ts b/tests/download-manager.test.ts
index 663da3b..c2e8a95 100644
--- a/tests/download-manager.test.ts
+++ b/tests/download-manager.test.ts
@@ -3998,6 +3998,78 @@ describe("download manager", () => {
     expect(fs.existsSync(path.join(extractDir, unexpectedName))).toBe(false);
   });
 
+  it("moves extracted MKV files into a flat library folder per completed package", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-dm-"));
+    tempDirs.push(root);
+
+    const packageName = "Flat-Pack";
+    const sourceFileName = "Season 1/Episode01.mkv";
+    const { session, packageId, itemId, originalExtractedPath } = createCompletedArchiveSession(root, packageName, sourceFileName);
+    const mkvLibraryDir = path.join(root, "mkv-library");
+
+    const manager = new DownloadManager(
+      {
+        ...defaultSettings(),
+        token: "rd-token",
+        outputDir: path.join(root, "downloads"),
+        extractDir: path.join(root, "extract"),
+        autoExtract: true,
+        autoRename4sf4sj: false,
+        collectMkvToLibrary: true,
+        mkvLibraryDir,
+        enableIntegrityCheck: false,
+        cleanupMode: "none"
+      },
+      session,
+      createStoragePaths(path.join(root, "state"))
+    );
+
+    const flattenedPath = path.join(mkvLibraryDir, "Episode01.mkv");
+    await waitFor(() => fs.existsSync(flattenedPath), 12000);
+
+    expect(manager.getSnapshot().session.packages[packageId]?.status).toBe("completed");
+    expect(manager.getSnapshot().session.items[itemId]?.fullStatus).toBe("Entpackt");
+    expect(fs.existsSync(flattenedPath)).toBe(true);
+    expect(fs.existsSync(originalExtractedPath)).toBe(false);
+  });
+
+  it("keeps existing MKV names and appends a suffix while flattening", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-dm-"));
+    tempDirs.push(root);
+
+    const packageName = "Flat-Collision";
+    const sourceFileName = "Season 1/Episode01.mkv";
+    const { session } = createCompletedArchiveSession(root, packageName, sourceFileName);
+    const mkvLibraryDir = path.join(root, "mkv-library");
+    fs.mkdirSync(mkvLibraryDir, { recursive: true });
+    const existingPath = path.join(mkvLibraryDir, "Episode01.mkv");
+    fs.writeFileSync(existingPath, "already-here", "utf8");
+
+    new DownloadManager(
+      {
+        ...defaultSettings(),
+        token: "rd-token",
+        outputDir: path.join(root, "downloads"),
+        extractDir: path.join(root, "extract"),
+        autoExtract: true,
+        autoRename4sf4sj: false,
+        collectMkvToLibrary: true,
+        mkvLibraryDir,
+        enableIntegrityCheck: false,
+        cleanupMode: "none"
+      },
+      session,
+      createStoragePaths(path.join(root, "state"))
+    );
+
+    const suffixedPath = path.join(mkvLibraryDir, "Episode01 (2).mkv");
+    await waitFor(() => fs.existsSync(suffixedPath), 12000);
+
+    expect(fs.existsSync(existingPath)).toBe(true);
+    expect(fs.readFileSync(existingPath, "utf8")).toBe("already-here");
+    expect(fs.existsSync(suffixedPath)).toBe(true);
+  });
+
   it("throws a controlled error for invalid queue import JSON", () => {
     const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-dm-"));
     tempDirs.push(root);
diff --git a/tests/storage.test.ts b/tests/storage.test.ts
index 1063415..db7a85d 100644
--- a/tests/storage.test.ts
+++ b/tests/storage.test.ts
@@ -84,6 +84,7 @@ describe("settings storage", () => {
       speedLimitKbps: -1,
       outputDir: "   ",
       extractDir: "   ",
+      mkvLibraryDir: "   ",
       updateRepo: "   "
     });
 
@@ -99,6 +100,7 @@ describe("settings storage", () => {
     expect(normalized.speedLimitKbps).toBe(0);
     expect(normalized.outputDir).toBe(defaultSettings().outputDir);
     expect(normalized.extractDir).toBe(defaultSettings().extractDir);
+    expect(normalized.mkvLibraryDir).toBe(defaultSettings().mkvLibraryDir);
     expect(normalized.updateRepo).toBe(defaultSettings().updateRepo);
   });
 
@@ -418,6 +420,8 @@ describe("settings storage", () => {
     expect(loaded.speedLimitMode).toBe(defaults.speedLimitMode);
     expect(loaded.clipboardWatch).toBe(defaults.clipboardWatch);
     expect(loaded.minimizeToTray).toBe(defaults.minimizeToTray);
+    expect(loaded.collectMkvToLibrary).toBe(defaults.collectMkvToLibrary);
+    expect(loaded.mkvLibraryDir).toBe(defaults.mkvLibraryDir);
     expect(loaded.theme).toBe(defaults.theme);
     expect(loaded.bandwidthSchedules).toEqual(defaults.bandwidthSchedules);
     expect(loaded.updateRepo).toBe(defaults.updateRepo);