Subtitle Shifter
Shift every subtitle cue forward or backward to resync captions with video.
Subtitle Shifter
Shift every subtitle cue forward or backward to resync captions with video.
| Output | Size | Actions |
|---|---|---|
| sample-shifted.srt | 133 chars |
About this subtitle shifter
The subtitle shifter moves every cue in a file forward or backward by a fixed amount, resyncing captions that run consistently early or late against the video. Enter the offset and it adjusts all the timestamps at once, then you download the corrected file.
It is the right fix when the whole track is off by the same gap — often from a different intro length or a frame-rate mismatch. If the drift grows over the course of the video, or only one section is wrong, a uniform shift will not fix it, and the partial shifter handles those cases.
Common uses
- Resync captions that appear consistently a second or two early or late.
- Correct a subtitle file after a fixed timing offset from a different video version.
- Nudge an SRT or VTT track into alignment with the audio.
Helpful tips
- Shift later when captions appear before the speech, earlier when they trail it.
- Test small steps like 250 or 500 milliseconds, then preview against the video.
- If the offset grows over time, use the partial shifter instead of a single shift.
How to use Subtitle Shifter
- Upload or paste the subtitle file you want to handle with Subtitle Shifter.
- Confirm the source format, cue order, encoding, and timing style before making changes.
- Run the conversion, cleanup, timing shift, merge, or edit action with a small timing check in mind.
- Preview captions near the beginning, middle, and end of the video to catch drift or formatting issues.
- Export the subtitle file in the format your video editor, player, or publishing platform expects.
Frequently asked questions
My subtitles drift more over time. Will a shift fix that?
No. A single shift moves every cue equally. Growing drift usually needs the partial shifter, which adjusts separate sections independently.
Does it work with SRT and VTT?
Yes. It shifts the timestamps in common text subtitle files and lets you download the resynced result.
Is Subtitle Shifter free, and does it work on mobile?
Yes. Subtitle Shifter is free to use on JustBloc with no account or installation, and the page is designed to work on desktop, tablet, and mobile browsers.