Fix Frame-Rate Subtitle Drift

Correct subtitles that slowly drift out of sync over time.

Nid oes angen mewngofnodiMae ffeiliau'n aros yn breifat

Drop a subtitle file (or paste below)

SRT, VTT, SBV, LRC, ASS, SSA, TXT dim cyfyngiad maint ffeil

Pori ffeiliau

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.

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.

Sut Mae'n Gweithio

Dewiswch Ffeil

Drop your file into the tool above. It stays entirely on your device — nothing is sent to any server.

Proses

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

Lawrlwythwch

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

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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.

Cwestiynau Cyffredin

Back to Subtitle Shifter / Resync