diff --git a/api/router.py b/api/router.py
index 4eabfcc..2118769 100644
--- a/api/router.py
+++ b/api/router.py
@@ -134,6 +134,35 @@ async def get_transcript(filename: str, user: dict = Depends(current_user)):
     return PlainTextResponse(content)
 
 
+@router.post("/transcripts/{filename}/reprocess")
+async def reprocess_transcript(filename: str, body: dict, user: dict = Depends(current_user)):
+    from output import read_transcript
+    from fastapi.responses import PlainTextResponse
+    from llm import OllamaClient
+    user_dir = os.path.join(user["output_dir"], user["username"])
+    content = read_transcript(user_dir, filename)
+    if content is None:
+        raise HTTPException(status_code=404, detail="Nicht gefunden")
+    # Strip YAML frontmatter before sending to LLM
+    body_text = content
+    if content.startswith("---\n"):
+        end = content.find("\n---\n", 4)
+        if end != -1:
+            body_text = content[end + 5:].lstrip("\n")
+    cfg = load_config()
+    instructions = body.get("instructions", "")
+    client = OllamaClient(base_url=cfg["ollama"]["base_url"])
+    refined = await client.refine(body_text, instructions=instructions, model=cfg["ollama"]["model"])
+    # Overwrite same file (keep filename stable, update frontmatter date)
+    from datetime import datetime
+    path = os.path.join(user_dir, filename)
+    with open(path, "w", encoding="utf-8") as f:
+        now = datetime.now()
+        f.write(f"---\ndate: {now.isoformat(timespec='seconds')}\ntags: [transkript]\n---\n\n")
+        f.write(refined if refined.endswith("\n") else refined + "\n")
+    return PlainTextResponse(refined)
+
+
 @router.delete("/transcripts/{filename}")
 async def delete_transcript(filename: str, user: dict = Depends(current_user)):
     user_dir = os.path.join(user["output_dir"], user["username"])
diff --git a/frontend/app.js b/frontend/app.js
index 0943af9..59ab963 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -10,7 +10,9 @@ const modalTitle = document.getElementById('modal-title');
 const modalBody = document.getElementById('modal-body');
 const modalOpenBtn = document.getElementById('modal-open-btn');
 const modalCloseBtn = document.getElementById('modal-close-btn');
+const modalReprocessBtn = document.getElementById('modal-reprocess-btn');
 let _modalPath = null;
+let _modalFilename = null;
 
 const STATUS_LABELS = {
   idle: 'Bereit',
@@ -43,6 +45,7 @@ logoutBtn.addEventListener('click', () => {
 
 function openModal(filename, path) {
   _modalPath = path;
+  _modalFilename = filename;
   modalTitle.textContent = filename.replace(/\.md$/, '').replace(/^\d{4}-\d{2}-\d{2}-\d{4}-/, '');
   modalBody.innerHTML = '';
   modal.classList.remove('hidden');
@@ -56,6 +59,7 @@ function openModal(filename, path) {
 function closeModal() {
   modal.classList.add('hidden');
   _modalPath = null;
+  _modalFilename = null;
 }
 
 modalCloseBtn.addEventListener('click', closeModal);
@@ -65,6 +69,20 @@ modalOpenBtn.addEventListener('click', () => {
   if (_modalPath) apiFetch('/open', { method: 'POST', body: JSON.stringify({ path: _modalPath }) });
 });
 
+modalReprocessBtn.addEventListener('click', async () => {
+  if (!_modalFilename) return;
+  modalReprocessBtn.disabled = true;
+  modalBody.textContent = 'Wird neu verarbeitet\u2026';
+  const instructions = instructionsEl.value;
+  const r = await apiFetch(`/transcripts/${encodeURIComponent(_modalFilename)}/reprocess`, {
+    method: 'POST',
+    body: JSON.stringify({ instructions }),
+  });
+  const md = await r.text();
+  modalBody.innerHTML = DOMPurify.sanitize(marked.parse(md));
+  modalReprocessBtn.disabled = false;
+});
+
 instructionsEl.addEventListener('input', async () => {
   await apiFetch('/instructions', {
     method: 'POST',
diff --git a/frontend/index.html b/frontend/index.html
index 4455148..b56de29 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -200,6 +200,11 @@
       <div class="modal-header">
         <span id="modal-title" class="modal-title"></span>
         <div class="modal-actions">
+          <button id="modal-reprocess-btn" class="modal-btn" title="Neu verarbeiten">
+            <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
+              <path d="M17.65 6.35A7.96 7.96 0 0 0 12 4a8 8 0 1 0 8 8h-2a6 6 0 1 1-1.76-4.24l-2.24 2.24H20V4l-2.35 2.35z"/>
+            </svg>
+          </button>
           <button id="modal-open-btn" class="modal-btn" title="Im Editor öffnen">
             <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
               <path d="M14 3h7v7h-2V6.41l-9.29 9.3-1.42-1.42L17.59 5H14V3zm-1 2H5a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-8h-2v8H5V7h8V5z"/>