Set conversion options
Drop or click to choose one subtitle file.
Positive values delay subtitles; negative values move them earlier.
Choose a subtitle file to begin.
Output preview
What is this tool for?
Convert SRT ⇄ VTT, export clean TXT scripts and shift timing in milliseconds for caption review and post-production.
3-step quick guide
- 1Choose or drop an SRT / VTT subtitle file.
- 2Select the output format and a positive or negative millisecond offset.
- 3Run the conversion, preview the result and download it.
Privacy statement
Subtitle text never leaves the device, is not stored, and has no remote upload endpoint.
There is no file-upload endpoint; practical speed depends on device performance and browser support.
Frequently asked questions
Are my subtitles uploaded?
No. Subtitle text is read by the browser File API and the result is generated locally as a Blob.
How many files can I process?
The single-file page is designed for careful editing; use the subtitle batch synchronizer for multiple files.
Does the source need a strict format?
Standard SRT or VTT timecodes are recommended. Incomplete blocks are preserved where possible and reported in the status line.