← All tools
Subtitle Sync and Converter
Shift subtitles earlier or later, fix frame-rate drift, and convert between SRT, VTT, ASS and plain text — right in your browser.
100% in-browser — nothing is uploaded
Frequently asked questions
- Are my files uploaded anywhere?
- No. All parsing and processing happens in your browser with JavaScript. The file is never sent to a server.
- My subtitles drift further out of sync near the end. Why?
- That usually means a frame-rate mismatch — for example subtitles authored for 23.976 fps played against a 25 fps copy. Use the frame-rate section rather than a simple offset.
- Which formats are supported?
- Input: SRT, WebVTT and ASS/SSA. Output: SRT, WebVTT, ASS and plain text.
- Is there a file size limit?
- We don't impose one. Processing is local, so speed depends on your device.