Add Audio to Video

Replace the audio track of any video with a custom sound file. Everything happens locally—your files never leave your browser.

Add Your Audio

Upload a video file and an audio file (MP3, WAV, AAC, etc.) to replace the original audio. Processing happens locally via WebAssembly.

Upload Video

MP4, MOV, AVI, etc.

Upload Audio

MP3, WAV, AAC, etc.

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How It Works

1Select a video – Drag & drop or click to browse. Supports MP4, MOV, AVI, etc.
2Select an audio file – Choose an MP3, WAV, AAC or other audio file to use as the new soundtrack.
3Add audio – Click the button; FFmpeg loads (once) and replaces the audio track while keeping the video stream untouched.
4Download & save – Get your video with the new audio instantly. The result is automatically saved to your workspace.

Privacy First

Why we’re different

Your video and audio files never leave your computer. All processing happens inside your browser using WebAssembly.

We don’t store, track, or analyze your files. After you close the tab, everything is gone.

Process large videos (1GB, 5GB or even 10GB). No artificial limits because everything runs on your hardware.

Every processed video is automatically saved to your personal workspace for easy access later.