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Subtitle Editor and Converter

Edit subtitle timing and convert formats without uploading video.

This calculator runs in your browser. Nothing is sent to a server.

Subtitles

SRT, VTT, or basic ASS dialogue text.

Output format

Shift ms

Extra scale

Source FPS fps

Target FPS fps

Times are multiplied by sourceFPS/targetFPS after shift.

Overlap

How it works

Processing stays in this browser tab. Source files are not uploaded. Export is a new copy; originals are not overwritten.