Subtitle Toolbox

Convert SRT ↔ WebVTT and optionally shift timestamps by a fixed offset. Runs locally (no uploads).

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Convert

Shift (ms)

Negative shift

Ready.

Input (paste file contents)

Supports basic cues; preserves cue text.

Output

No network calls.

Notes: VTT timestamps may be MM:SS.mmm or HH:MM:SS.mmm. SRT uses HH:MM:SS,mmm. We normalize to padded hours.