Resync SRT, VTT, or ASS Subtitles

Shift timing in whatever subtitle format you have.

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.

subtitle formats tips

🔤

Works with SRT, WebVTT, SBV, LRC, and ASS — the format is detected and preserved on export.

🔁

To also change format, pair this with the Subtitle Converter.

🎯

The first-cue preview confirms the new timing before you download.

🔒

Everything runs in your browser.

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.

Pam defnyddio ein un ni?

✓Hollol rhad ac am ddim - dim costau cudd, byth

✓Nid oes angen cyfrif, e-bost na mewngofnodi

✓Nid yw ffeiliau byth yn gadael eich dyfais

✓Dim cyfyngiadau maint ffeil o gwbl

✓Dim dyfrnodau ar unrhyw allbwn

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.

🎞️

Fix Frame-Rate Subtitle Drift

Correct subtitles that slowly drift out of sync ov

✂️

Resync Subtitles for a Different Cut

Shift subtitles to match a version with a differen

Cwestiynau Cyffredin

Back to Subtitle Shifter / Resync