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Slide the sound in CapCut’s timeline, rule out the causes that put an export out of step, or fix the finished file without opening the project again.
To fix audio out of sync in CapCut, separate the sound from the clip so it sits on its own track (the menu item is called Extract audio or Separate audio depending on your version), then drag that audio a few frames left or right until speech matches the lips, zooming in on the timeline for fine moves. If the project plays in sync but the exported video doesn’t, the cause is in the source footage or the export, and it is usually quicker to fix the finished file.
For a finished file, open the export in the tool above, press Detect automatically or line up a clap, nudge the sound in 10 ms or 1 ms steps and press Export video. The picture is copied as CapCut made it, so there is no second round of compression, and the corrected file is ready to post.
Select the clip on the timeline and choose Extract audio or Separate audio (right-click on a computer, the toolbar on a phone). The sound appears as its own track under the picture.
Zoom into the timeline, find a clear moment such as a clap or a hard consonant, and drag the audio track until its waveform peak sits under the right frame. Play it back to check.
If the export is out of sync, open it above, press Detect automatically (A) or Jump to the clap (C) and This frame is the clap (K), fine-tune with Earlier and Later, then Export video.
Phone and screen recordings often change their frame rate as they record. An editor that treats every frame as the same length can let the sound drift against the picture over a long clip. If the gap grows through the clip, it is drift rather than an offset; see fix audio drift.
A voice-over or a separate microphone recording starts at a different moment from the camera, so it needs lining up once. Two recordings of the same moment can be lined up automatically by their sound with Sync separate recordings, and then imported into CapCut already in step.
Changing a clip’s speed or trimming the picture but not its separated audio leaves the two different lengths. Keep speed changes on clips whose sound is still attached, or adjust both tracks together.
When the project is finished and only the exported file is off, re-opening and re-exporting the project means another round of compression and another wait. Correcting the file avoids both:
The same applies to files from other editors and players; if you found the delay by ear in a player, the VLC guide shows how to carry that number over.
The source footage may have a variable frame rate, the audio may have been trimmed or sped up separately, or the separated audio was nudged by mistake. Check the project; if it plays in sync, fix the exported file directly.
Select the clip and use Extract audio or Separate audio (the name depends on the version). The sound then sits on its own track and can be dragged on its own.
Yes. Open the exported file in the tool above, set the offset and export: the picture is copied, so there is no extra compression.
About one frame when you zoom in. For finer steps, correct the exported file here, where the sound moves in 1 ms steps.
Yes. The tool runs in a recent Safari or Chrome, so you can fix a CapCut export without moving it to a computer.