diff --git a/index.html b/index.html
index 991a1a3..4ffe373 100644
--- a/index.html
+++ b/index.html
@@ -200,6 +200,9 @@
       <button id="mark-end">Mark end</button><span class="mark-time" id="highlight-end">--:--:--</span>
       <input id="highlight-label" placeholder="Highlight name" maxlength="120">
       <button id="save-highlight">Add highlight</button>
+      <span style="flex:1"></span>
+      <button id="export-csv" title="Download all highlights as CSV">Export CSV</button>
+      <button id="export-json" title="Download all highlights as JSON">Export JSON</button>
     </div>
     <div class="highlight-list" id="highlight-list"><span style="color:var(--dim);font-size:12px">No highlights yet.</span></div>
   </section>
@@ -397,6 +400,8 @@
   }
   document.querySelector("#mark-start").onclick = () => setMark("start");
   document.querySelector("#mark-end").onclick = () => setMark("end");
+  document.querySelector("#export-csv").onclick = () => location.href = "/api/highlights/export?format=csv";
+  document.querySelector("#export-json").onclick = () => location.href = "/api/highlights/export?format=json";
   document.querySelector("#save-highlight").onclick = async () => {
     if (highlightStart === null || highlightEnd === null || highlightStart >= highlightEnd) return;
     await fetch("/api/highlights", {method: "POST", headers: {"Content-Type": "application/json"},
diff --git a/server.py b/server.py
index d241c22..cd01d3b 100644
--- a/server.py
+++ b/server.py
@@ -102,6 +102,8 @@ class PlayerHandler(BaseHTTPRequestHandler):
             return self.send_json(self.server.encode_status)
         if request.path == "/api/highlights":
             return self.send_json(self.server.highlights)
+        if request.path == "/api/highlights/export":
+            return self.export_highlights()
         if request.path == "/api/system-highlights":
             date = parse_qs(request.query).get("date", [""])[0]
             return self.send_json([item for item in self.server.system_highlights if item["date"] == date])
@@ -149,6 +151,45 @@ class PlayerHandler(BaseHTTPRequestHandler):
             return self.send_json(highlight)
         self.send_error(404)
 
+    def export_highlights(self):
+        fmt = parse_qs(urlparse(self.path).query).get("format", ["csv"])[0].lower()
+        items = sorted(self.server.highlights, key=lambda h: (h["date"], h["start"], h["id"]))
+        seen = {}
+        rows = []
+        for item in items:
+            # same label may repeat across days; within one day duplicates get -2, -3...
+            key = (item["date"], item["label"])
+            seen[key] = seen.get(key, 0) + 1
+            name = item["label"] if seen[key] == 1 else f"{item['label']} ({seen[key]})"
+            def clock(sec):
+                return f"{sec // 3600:02d}:{sec % 3600 // 60:02d}:{sec % 60:02d}"
+            rows.append({
+                "date": f"{item['date'][:4]}-{item['date'][4:6]}-{item['date'][6:]}",
+                "name": name,
+                "start": clock(item["start"]),
+                "end": clock(item["end"]),
+                "duration_sec": item["end"] - item["start"],
+                "clip": f"{item['date']}/{item['start'] // 3600:02d}.{item['start'] % 3600 // 60:02d}.{item['start'] % 60:02d}",
+            })
+        if fmt == "json":
+            data = json.dumps(rows, indent=2).encode()
+            ctype = "application/json"
+        else:
+            import io
+            buf = io.StringIO()
+            writer = __import__("csv").writer(buf)
+            writer.writerow(["date", "name", "start", "end", "duration_sec", "clip"])
+            writer.writerows((r["date"], r["name"], r["start"], r["end"], r["duration_sec"], r["clip"]) for r in rows)
+            data = buf.getvalue().encode()
+            ctype = "text/csv"
+        stamp = datetime.now().strftime("%Y%m%d-%H%M%S")
+        self.send_response(200)
+        self.send_header("Content-Type", f"{ctype}; charset=utf-8")
+        self.send_header("Content-Disposition", f'attachment; filename="highlights-{stamp}.{fmt}"')
+        self.send_header("Content-Length", str(len(data)))
+        self.end_headers()
+        self.wfile.write(data)
+
     def handle_upload(self):
         try:
             length = int(self.headers.get("Content-Length", "0"))