Sync
Deck
Subtitle synchronization — runs entirely in your browser.
No install, no upload to a server.
Reference — correct timing
Drop the subtitle extracted from the video, or click to browse
To Sync — needs correcting
Drop the subtitle you want to line up, or click to browse
2-Point Sync
Line-by-Line Match
Correction map
Point 1 — near the start
Reference
Use selected
To Sync
Use selected
Point 2 — near the end
Reference
Use selected
To Sync
Use selected
Offset
—
Speed factor
—
Shift only (ignore Point 2, no speed change)
Fine-tune
−1s
−100ms
0 ms
+100ms
+1s
Reset
Upload the reference subtitle to see its lines here.
Upload the subtitle you want to sync to see its lines here.
Auto-detect matches
Reset manual fixes
Fine-tune
−1s
−100ms
0 ms
+100ms
+1s
Upload both files, then click "Auto-detect matches".
Upload both subtitle files to build the line-by-line match.
Set both sync points to enable export.
Download synced subtitle