Sync Subtitles OnlineFix subtitles that come too early, too late or drift.

Open the subtitles with the video, find the right moment on the waveform and shift every cue by the difference.
Subtitles that drift further off over time are fixed by two-point sync or a frame-rate change. Works with SRT, VTT, ASS and more.

Shift & stretch23.976 ↔ 25 fpsVideo preview

No sign-up No upload No watermark

Drop subtitles and a video

Open a subtitle file, a video or audio file, or both at once. Several subtitle files open the batch converter.

SRTVTTASSSSASBVTTMLDFXPSUBLRCTXT

Old files in Windows code pages, GB18030, Shift_JIS or EUC-KR are read correctly.

THREE SIMPLE STEPS

How to use the Subtitle Sync

Open both files

Drop the subtitles together with the video or audio they belong to.

Find the offset

Play to a line, and use the playhead to shift every cue, or sync by a cue near the start and one near the end.

Save

Check the preview and download the synced file in the same format or another.

WaveSpeed AI

Make the video, then subtitle it.

Create clips from a prompt or an image with WaveSpeed AI, then edit their subtitles here for free.

Start creating Explore 1,000+ AI Models

1,000+ AI models
Image, video and 3D
Pay as you go

$1 in free credits for eligible new accounts. No card needed. Generators have separate account and credit requirements. The subtitle editor is free.

Subtitle Sync FAQ

My subtitles are a few seconds late. How do I fix that?

Select the first cue, play the video to where it should start, use the gap to the playhead as the offset, and shift all cues earlier.

The start is right but the end is off. Why?

The subtitles were timed for a different frame rate or cut. Use Sync by two points (a cue near the start and one near the end), or Change frame rate when you know the two rates, such as 23.976 and 25.

Is it private?

Yes. Subtitles and video stay in your browser; nothing is uploaded.

Can I sync only part of the subtitles?

Yes. Select cues in the list and shift only those, or shift every cue from the selected one on, which fixes a delay that starts after a cut.

All Free Tools

Subtitle Editor SRT editor SRT to VTT VTT to SRT ASS to SRT Subtitle converter