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.
Drop your file here or click to browse
Preview
Trim range
Duration:
Crop area
Original size: →
Crop area
Original size:
Trim range
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.
Preview
Your file is ready to download
Your files never leave your browser
Frequently asked questions
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.
2 item(s)
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