Fixing subtitles that lag by 2.5 seconds
An SRT file with subtitles appearing too late, offset -2500
Every timestamp shifted 2.5 seconds earlier — the same SRT, back in sync with the video.
Subtitle Converter & Sync
Convert subtitles between SRT and VTT, and shift every timestamp by a fixed offset to fix sync.
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About this tool
SRT and VTT encode the same idea — timed text — with small but incompatible differences (a comma versus a period in the timestamp, VTT's required header). A subtitle that's drifted out of sync usually needs the same fix applied to every single line, which is exactly the tedious part a script handles better than a text editor's find-and-replace.
How to use it
- Paste or upload an SRT or VTT file — the format is detected automatically.
- Pick the output format and, if the subtitles are out of sync, an offset in milliseconds (negative to shift earlier).
- Copy or download the converted, resynced result.
Examples
Common problems
- The offset makes some subtitles disappear entirely.
- A cue shifted before 00:00:00 is clamped to zero rather than going negative — several subtitles very early in the file, all shifted earlier by a large offset, can end up stacked at the very start. This is usually a sign the offset is larger than actually needed.