Subtitles
Sync Subtitles to Video Online – Align Captions to Speech
VideoMuto aligns subtitle timing to the speech in a video in your browser.
- No file limits
- No registration
- Free forever
- Videos never leave your browser
Syncing happens locally in your browser. Your files never leave your device.
Everything runs locally — your file never leaves this device.
fix subtitles that drift out of sync. The tool aligns cue timing to the audio automatically.
How to Sync Subtitles
Add Video and Subtitles
Drop the video and its subtitle file onto the page.
Run Auto-Sync
Let the tool align the caption timing to the audio.
Download the Synced File
Download the re-timed subtitle file.
Why Sync Subtitles?
Out-of-sync captions are worse than none — they confuse and annoy viewers.
Auto-sync fixes timing in seconds instead of manual nudging.
Subtitle Sync Options
| Method | Auto-align to audio + manual nudge |
|---|---|
| Output | Re-timed subtitle file |
| File size limit | None, limited only by your browser |
| Registration | Not required |
| Upload | None, processed on your device |
Frequently asked questions
Why do subtitles drift?
Different versions of a video, or small cuts, shift timing. Syncing re-aligns captions to the current audio.
Can I nudge timing manually too?
Yes — after auto-sync, you can still shift the whole track or individual cues.
Related tools
Your videos never leave your browser
All processing happens locally on your device. Nothing is uploaded to a server, stored, or tracked.