AppHelp
Shift subtitle timing by milliseconds
Paste SRT or WebVTT subtitles and offset every timestamp by the amount you choose — everything runs locally.
Negative values move subtitles earlier; timestamps never go below zero.
1 00:00:01,500 --> 00:00:04,500 Hello, AppHelp! 2 00:00:05,750 --> 00:00:09,000 Everything runs locally.
Features
- Shift SRT and WebVTT timestamps by milliseconds
- Supports negative offsets to move subtitles earlier
- Clamps timestamps at zero and preserves the original format
- Runs entirely in the browser
Frequently asked questions
- Does it keep the SRT or VTT format?
- Yes. The original timestamp separator and WEBVTT header are preserved, so SRT stays SRT and VTT stays VTT.
- What happens if a timestamp goes negative?
- Timestamps are clamped to 00:00:00,000 so they never become negative after a large negative offset.
- Does it upload my subtitles?
- No. Everything runs locally in your browser.