Fix Frame-Rate Subtitle Drift
Correct subtitles that slowly drift out of sync over time.
Drop a subtitle file (or paste below)
SRT, VTT, SBV, LRC, ASS, SSA, TXT ファイルサイズ制限なし
Positive delays the subtitles (use if they appear too early); negative advances them (if they lag the audio).
💡 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.
frame rate tips
If subtitles drift further off as the video plays, it's usually a frame-rate mismatch — use the speed factor (e.g. 23.976→25).
Combine a speed factor with a small offset to nail both the drift and the start point.
Common conversions are provided as one-click buttons.
Nothing is uploaded.
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Also check out…
Fix Subtitles That Appear Too Early
Delay subtitles so they line up with later audio.
Fix Subtitles That Lag the Audio
Advance subtitles that appear after the dialogue.
Resync Subtitles for a Different Cut
Shift subtitles to match a version with a differen
Resync SRT, VTT, or ASS Subtitles
Shift timing in whatever subtitle format you have.