diff --git a/bincio/serve/server.py b/bincio/serve/server.py
index 3e6e202..983a07d 100644
--- a/bincio/serve/server.py
+++ b/bincio/serve/server.py
@@ -465,43 +465,57 @@ _SUPPORTED_SUFFIXES = {".fit", ".gpx", ".tcx", ".fit.gz", ".gpx.gz", ".tcx.gz"}
 
 @app.post("/api/upload")
 async def upload_activity(
-    file: UploadFile = File(...),
+    files: list[UploadFile] = File(...),
     bincio_session: Optional[str] = Cookie(default=None),
 ) -> JSONResponse:
+    from bincio.extract.ingest import ingest_parsed
+    from bincio.extract.parsers.factory import parse_file
+    from bincio.extract.writer import make_activity_id
+    from bincio.render.merge import merge_all
+
     user = _require_user(bincio_session)
     dd = _get_data_dir() / user.handle
-    name = Path(file.filename or "upload.fit").name
-    p = Path(name.lower())
-    suffix = (p.stem.rsplit(".", 1)[-1].join([".", ".gz"]) if "." in p.stem else ".gz") if p.suffix == ".gz" else p.suffix
-    if suffix not in _SUPPORTED_SUFFIXES:
-        raise HTTPException(400, f"Unsupported file type '{suffix}'")
-    contents = await file.read()
-    if len(contents) > 50 * 1024 * 1024:
-        raise HTTPException(413, "File too large (max 50 MB)")
     staging = dd / "_uploads"
     staging.mkdir(exist_ok=True)
-    staged = staging / name
-    staged.write_bytes(contents)
-    try:
-        from bincio.extract.ingest import ingest_parsed
-        from bincio.extract.parsers.factory import parse_file
-        activity = parse_file(staged)
-        activity_id_check = dd / "activities" / f"{activity.source_file}.json"
-        from bincio.extract.writer import make_activity_id
-        activity_id = make_activity_id(activity)
-        if (dd / "activities" / f"{activity_id}.json").exists():
-            raise HTTPException(409, f"Activity already exists: {activity_id}")
-        ingest_parsed(activity, dd, privacy="public")
-        from bincio.render.merge import merge_all
+
+    results = []
+    any_added = False
+
+    for file in files:
+        name = Path(file.filename or "upload.fit").name
+        p = Path(name.lower())
+        suffix = (p.stem.rsplit(".", 1)[-1].join([".", ".gz"]) if "." in p.stem else ".gz") if p.suffix == ".gz" else p.suffix
+        if suffix not in _SUPPORTED_SUFFIXES:
+            results.append({"name": name, "ok": False, "error": f"Unsupported file type '{suffix}'"})
+            continue
+
+        contents = await file.read()
+        if len(contents) > 50 * 1024 * 1024:
+            results.append({"name": name, "ok": False, "error": "File too large (max 50 MB)"})
+            continue
+
+        staged = staging / name
+        staged.write_bytes(contents)
+        try:
+            activity = parse_file(staged)
+            activity_id = make_activity_id(activity)
+            if (dd / "activities" / f"{activity_id}.json").exists():
+                results.append({"name": name, "ok": False, "error": "duplicate"})
+                continue
+            ingest_parsed(activity, dd, privacy="public")
+            results.append({"name": name, "ok": True, "id": activity_id})
+            any_added = True
+        except Exception as exc:
+            results.append({"name": name, "ok": False, "error": f"{type(exc).__name__}: {exc}"})
+        finally:
+            staged.unlink(missing_ok=True)
+
+    if any_added:
         merge_all(dd)
         _trigger_rebuild(user.handle)
-    except HTTPException:
-        raise
-    except Exception as exc:
-        raise HTTPException(422, f"Failed to process activity: {type(exc).__name__}: {exc}")
-    finally:
-        staged.unlink(missing_ok=True)
-    return JSONResponse({"ok": True, "id": activity_id})
+
+    added = [r for r in results if r["ok"]]
+    return JSONResponse({"ok": True, "added": len(added), "results": results})
 
 
 @app.post("/api/strava/sync")
diff --git a/site/src/layouts/Base.astro b/site/src/layouts/Base.astro
index 5411cff..679daf8 100644
--- a/site/src/layouts/Base.astro
+++ b/site/src/layouts/Base.astro
@@ -256,8 +256,8 @@ try {
             id="upload-drop"
             class="border-2 border-dashed border-zinc-700 rounded-lg p-8 text-center text-zinc-500 text-sm cursor-pointer hover:border-zinc-500 hover:text-zinc-300 transition-colors"
           >
-            <div id="upload-label">Drop a FIT, GPX, or TCX file<br/>or click to browse</div>
-            <input id="upload-input" type="file" accept=".fit,.gpx,.tcx,.fit.gz,.gpx.gz,.tcx.gz" class="hidden" />
+            <div id="upload-label">Drop FIT, GPX, or TCX files<br/>or click to browse</div>
+            <input id="upload-input" type="file" accept=".fit,.gpx,.tcx,.fit.gz,.gpx.gz,.tcx.gz" class="hidden" multiple />
           </div>
           <p id="upload-status" class="mt-3 text-xs text-center" style="color: var(--text-5); min-height: 1.25rem"></p>
         </div>
@@ -437,24 +437,31 @@ try {
         e.preventDefault();
         drop.style.borderColor = '';
         drop.style.color = '';
-        if (e.dataTransfer?.files[0]) doUpload(e.dataTransfer.files[0]);
+        if (e.dataTransfer?.files.length) doUpload(e.dataTransfer.files);
       });
-      input.addEventListener('change', () => { if (input.files?.[0]) doUpload(input.files[0]); });
+      input.addEventListener('change', () => { if (input.files?.length) doUpload(input.files); });
 
-      async function doUpload(file) {
-        label.textContent = file.name;
-        fileStatus.textContent = 'Uploading…';
+      async function doUpload(files) {
+        const n = files.length;
+        label.textContent = n === 1 ? files[0].name : `${n} files selected`;
+        fileStatus.textContent = `Uploading ${n} file${n > 1 ? 's' : ''}…`;
         fileStatus.style.color = 'var(--text-4)';
         drop.style.pointerEvents = 'none';
         const fd = new FormData();
-        fd.append('file', file);
+        for (const f of files) fd.append('files', f);
         try {
-          const r = await fetch(`${editUrl}/api/upload`, { method: 'POST', body: fd });
+          const r = await fetch(`${editUrl}/api/upload`, { method: 'POST', credentials: 'include', body: fd });
           if (!r.ok) throw new Error(await r.text());
           const d = await r.json();
-          fileStatus.textContent = 'Done! Opening activity…';
-          fileStatus.style.color = '#4ade80';
-          setTimeout(() => { window.location.href = `${baseUrl}activity/${d.id}/`; }, 600);
+          const dupes = d.results.filter(r => r.error === 'duplicate').length;
+          const errors = d.results.filter(r => !r.ok && r.error !== 'duplicate').length;
+          let msg = `${d.added} added`;
+          if (dupes) msg += `, ${dupes} duplicate${dupes > 1 ? 's' : ''}`;
+          if (errors) msg += `, ${errors} failed`;
+          fileStatus.textContent = msg;
+          fileStatus.style.color = d.added > 0 ? '#4ade80' : '#a1a1aa';
+          if (d.added > 0) setTimeout(() => { window.location.reload(); }, 1200);
+          else drop.style.pointerEvents = '';
         } catch (e) {
           fileStatus.textContent = 'Error: ' + e.message;
           fileStatus.style.color = '#f87171';