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Libre Subtitle Shifter / Resync

Fix out-of-sync subtitles — shift all timings earlier or later and correct frame-rate mismatches. Keeps the original format. Runs in your browser.

Sen límite de tamaño de ficheiroOs ficheiros permanecen privadosNon é necesario iniciar sesiónLibre para sempre

Drop a subtitle file (or paste below)

SRT, VTT, SBV, LRC, ASS, SSA, TXT sen límite de tamaño de ficheiro

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Subtitle text

Time shift (seconds)0s

Positive delays the subtitles (use if they appear too early); negative advances them (if they lag the audio).

Speed factor (for frame-rate mismatches)

💡 Fixes subtitles that are out of sync — shift everything earlier or later, and correct frame-rate mismatches with the speed factor. The format is detected and preserved. Everything runs in your browser.

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Fix Subtitles That Appear Too Early Fix Subtitles That Lag the Audio Fix Frame-Rate Subtitle Drift Resync Subtitles for a Different Cut Resync SRT, VTT, or ASS Subtitles

Como funciona

When subtitles run ahead of or behind the audio, you just need to shift their timing. This re-times every cue in your browser, keeping the file format intact.

1
You paste or drop a subtitle file
SRT, VTT, SBV, LRC, or ASS — the format is detected automatically. Nothing is uploaded.
2
You set a time shift
Enter seconds (positive to delay, negative to advance) or use the quick presets. A speed factor also corrects frame-rate mismatches (e.g. 23.976↔25 fps).
3
Every cue is re-timed
Each cue's start and end are adjusted by the offset (and factor), clamped so nothing goes negative.
4
You download the synced file
The result is written back in the same format, ready to use.