diff --git a/ttstoy/webui/app.py b/ttstoy/webui/app.py
index 33a2099..f0b4b9b 100644
--- a/ttstoy/webui/app.py
+++ b/ttstoy/webui/app.py
@@ -952,6 +952,22 @@ def api_chatterbox_upload():
             loops = (6000 // len(seg)) + 1
             seg = seg * loops
             log.debug(f"Voice upload: looped clip to {len(seg)}ms")
+        if len(seg) > 30000:
+            trimmed = seg[:30000]
+            try:
+                from pydub.silence import detect_silence
+                search_start = max(0, 30000 - 1500)
+                silences = detect_silence(
+                    seg[search_start:30000], min_silence_len=300, silence_thresh=-40
+                )
+                if silences:
+                    cutoff_local = silences[0][0]
+                    if cutoff_local > 100:
+                        trimmed = seg[: search_start + cutoff_local]
+            except Exception:
+                pass
+            seg = trimmed
+            log.debug(f"Voice upload: trimmed clip to {len(seg)}ms")
         buf = _io.BytesIO()
         seg.export(buf, format="wav")
         audio_bytes = buf.getvalue()