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Subtitle utility

Subtitle Time Shifter

Move subtitle timestamps forward or backward for SRT, VTT, and ASS files.

Free No signup Browser-local

Subtitle input

No signup. No server upload. Browser-only processing.

Drop a subtitle file here or choose one manually

Supports SRT, VTT, and ASS where relevant to the tool.

Selected file: sample.srt

Use positive numbers to delay captions and negative numbers to move them earlier.

Shifted subtitle output

Runs locally in your browser

Selected file: sample.srt

When to use this tool

Use this when subtitles start too early or too late, but the cue order is otherwise correct.

  • Fix subtitles that lag behind the speaker.
  • Repair captions after editing the intro of a video.
  • Quickly offset a whole subtitle file without opening a timeline editor.

FAQ

Can I use negative numbers? +

Yes. Negative values move subtitles earlier and positive values delay them.

Will this preserve the original format? +

Yes. SRT stays SRT, VTT stays VTT, and ASS stays ASS after the shift.