Subtitle Timing Shifter

Edit SRT and WebVTT timing without uploading the file. Cue text is always displayed as plain text—embedded subtitle markup is never executed.

1. Subtitle source

Open .srt or .vtt

Subtitle text (maximum 5 MB / 50,000 cues)

Processing and downloads stay in this browser. No network requests or external libraries are used.

Order: optional rebase → stretch around anchor → frame-rate scale → shift.

Shift (seconds)

Stretch factor

Stretch anchor (seconds)

Negative timestamps

Rebase first cue to 00:00 Convert frame rate

Source FPS

Target FPS

Export format

Newlines