Subtitle Sync Fixer — Free & Online
When subtitles start fine but drift further out of sync over time, it is a framerate mismatch. Fix it with two anchor points — no math needed.
Pick two moments: when a line appears now and when it should appear. Two anchors fix drift automatically.
Anchor 1 (early in the video)
Anchor 2 (late in the video)
How to use the Subtitle Sync Fixer
- Find two anchor moments. Note when a line appears now and when it should appear, early and late in the video.
- Enter both anchors. Type the wrong time and correct time for each anchor point.
- Download synced file. Linear correction rescales all cues; the fixed SRT downloads automatically.
Frequently Asked Questions
How is this different from shifting?
Shifting moves every cue by the same amount. Sync fixing rescales timing linearly, which corrects subtitles that start correctly but drift apart over the runtime.
Can I fix just an offset with this tool?
Yes — leave Anchor 2 empty and it behaves as a constant shifter using Anchor 1.