MP4 → MP4
Sync Audio and Video
Fix audio and video sync drift in your browser with local processing, without uploads or watermarks.
Drop your file here or click to browse
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Normalizes perceived loudness to broadcast standard (-16 LUFS). No settings needed.
Automatically detects and removes letterbox black bars from all sides.
Drop a video file to view its codec, resolution, duration, and file size.
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Your files never leave your browser
Frequently asked questions
What causes audio/video sync issues?
Variable frame rates, recording glitches, or codec mismatches can cause audio to drift out of sync with video.
Are my files uploaded?
No. Everything runs locally in your browser. Your files never leave your device.
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