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Fix Audio Delay in a Video
Audio lagging behind the picture, or arriving too early? Shift the soundtrack by milliseconds and download — the video is copied untouched, so it takes seconds.
To fix audio delay in a video, upload the file, enter the shift in milliseconds — a negative number pulls lagging audio forward, a positive number pushes early audio back — click Process and download. The picture is stream-copied, so the fix is instant and lossless; most delays are 100–500 ms. Free, in your browser.
Enter the delay in milliseconds (negative if the audio lags)
Click Process, check a spoken line, download
Features
Shift audio forward or back in 10 ms steps
No re-encode of the video — lossless and fast
Works on MP4, MOV, MKV, WebM, AVI
Free, private, no watermark
Frequently Asked Questions
The audio lags more and more as the video plays — will this fix it?
A fixed shift fixes a constant offset. A growing drift means the frame rate or sample rate is off: convert the video to a constant frame rate first, then apply the remaining fixed offset here.