All tools
Subtitle Sync and FPS Converter
Fix SRT and WebVTT subtitles that appear early, late, or gradually drift. Processing stays in your browser.
Local processing — your file is not sent to a server
The file stays in your browser.
How to use this tool
- 1Load or paste an SRT or VTT file.
- 2Enter a positive or negative offset and, if needed, source and target FPS.
- 3Preview the first cues and download the corrected file.
Frequently asked questions
- Is my subtitle uploaded?
- No. Parsing, timing conversion, preview, and download run locally in your browser.
- What offset fixes early subtitles?
- Use a positive offset to move early subtitles later.
- Can I combine FPS conversion and offset?
- Yes. FPS scaling is applied first, followed by the constant offset.