Subtitle Sync: browser-local media tool
Shift all subtitle timestamps by milliseconds.
Related
See the Videos category for more tools.
Try the workspace above.
Subtitle Sync
Shift all subtitle timestamps by milliseconds.
Workspace
Shift all subtitle timestamps by milliseconds.
Drop SRT/VTT
Positive = later, negative = earlier
Input
Output
What can you do with it?
Finish “Subtitle Sync”
Shift all subtitle timestamps by milliseconds.
Preview before export
Confirm output on the page
Download result
Save media or subtitle files
Lightweight handoff
Process quickly then share
No install
Works in the browser
Local-first
Processing is local in the browser; FFmpeg core downloads from CDN on first use.
Why choose this tool?
Subtitle Sync
Shift all subtitle timestamps by milliseconds.
On-page feedback
See progress and results
Easy export
Download processed files
Clear privacy model
Processing is local in the browser; FFmpeg core downloads from CDN on first use.
How to use?
1
Provide input
Pick media or paste subtitles
2
Configure & run
Set options then process
3
Download
Save the output
FAQ
- Is my media uploaded?
- Not to app servers by default. FFmpeg.wasm tools transcode in the browser; the wasm core is fetched from CDN first time.
- Large files?
- Browser memory limits apply. Test with short clips first.
- Why first run is slow?
- FFmpeg core download. It can be cached afterwards.