Resynchronise SRT or VTT subtitles with an offset

Choose offset direction

1. Import or paste an SRT or VTT subtitle file.
2. Enter an offset in seconds: positive for later, negative for earlier. Up to three decimal places are accepted.
3. Prepare the result, check the initial timestamps and download the adjusted file.

Example: a subtitle appears early

Original start: 00:00:10,000
Offset: +2.5 seconds
New start: 00:00:12,500
Each cue end is shifted by the same interval

Check beginning and end

If a timestamp would become negative, processing is refused: cues are not silently deleted or shortened. Choose a smaller negative offset.

Test the download in your player at the beginning, middle and end. If the error grows over time, a constant offset is insufficient: this tool does not correct playback speed differences.

Formats and limits

Maximum 2 MB text and 20,000 cues. VTT shifting keeps NOTE, STYLE and REGION blocks and updates inline timestamps. MPEG-synchronised X-TIMESTAMP-MAP files are not supported.

The original stays intact and processing is local. Download your copy before leaving; keep the original to return to its timestamps.