Video Audio Replacement Tool - Swap Audio Tracks

Replace video's audio track with new music or narration. Upload video and audio files, adjust volume, preview results. Browser-based, private.

1. Upload Video

Drop video file here or click to select

2. Upload Audio

Drop audio file here or click to select

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Frequently Asked Questions

Video audio replacement removes the original audio track from a video and substitutes it with a different audio file. Common uses include adding background music to silent videos, replacing poor-quality audio with studio-recorded narration, dubbing videos in different languages, or creating promotional videos with custom soundtracks.

The tool accepts MP3, WAV, AAC, OGG, M4A, and FLAC audio files. All formats are converted to AAC in the output video for maximum compatibility across devices and platforms.

No. The tool uses stream copying for the video track, meaning the video is not re-encoded at all. Only the audio is processed, so your video maintains its original quality while getting a new audio track.

The output video duration matches whichever is shorter. If the audio is longer, it will be trimmed. If the video is longer, the output will end when the audio finishes. This ensures audio and video stay synchronized throughout.

Yes. The tool includes a volume slider ranging from 0% to 200%. You can make the audio quieter or louder before processing. Preview both files before replacing to ensure the volume level works well.

Most common video formats are supported: MP4, WebM, AVI, MOV, MKV, FLV, and more. The output is always MP4 with H.264 video and AAC audio for universal compatibility.

Yes. The tool replaces the entire audio track, removing any original sound from the video. The output contains only the new audio you uploaded. If you want to mix original audio with new audio, you'll need audio mixing software first.

Processing happens in your browser using WebAssembly. Most videos up to 500MB and audio files up to 100MB work well. Larger files may take longer to process depending on your device's memory and CPU speed.

Absolutely. This is perfect for screen recordings, tutorials, or presentations where you want to replace the original microphone audio with a cleaner studio recording or different narration.

No. All processing happens locally in your browser using FFmpeg WebAssembly. Your video and audio files never leave your device. Everything is completely private and secure.

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