MP4 → MP4
Add Audio to Video
Add an audio or music track to a video in your browser with local processing, without uploads or watermarks.
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Duration:
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Original size: →
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Original size:
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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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Întrebări frecvente
What formats are supported?
MP4 and MOV video input. You can add MP3, WAV, or M4A audio tracks.
Are my files uploaded?
No. Everything runs locally in your browser. Your files never leave your device.
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