A subtitle editor that runs entirely in your browser. Load an SRT or VTT file, edit and resync the cues, convert between formats, then export. Nothing is uploaded.
01 Load subtitles
Drop an .srt or .vtt file here
or click to browse
02 Edit cues
0 cues
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Start
End
Text
Ops
No cues yet. Load a file or paste text above.
03 Resync timing
Positive delays subtitles, negative moves them earlier. Times never go below zero.
Fixes frame-rate drift. Give a current time and the correct time for two moments; all cues are rescaled linearly.
→
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04 Convert and export
05 Preview and validation
Nothing to preview yet.
No cues loaded.
06 Burn subtitles into video
Coming soon. Burning captions permanently into a video (hardsubbing) is on the roadmap and will use in-browser ffmpeg.wasm, the same engine as our video tool. For now, finish the job in Mux, which already runs ffmpeg locally in your browser.