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ConvertBox

Extract Audio

Extract audio from MP4, MOV, AVI, and other video files for free. Save as MP3. No upload needed — all processing happens locally in your browser.

How to Use

  1. Select the video file to extract audio from
  2. Choose an audio format (MP3, WAV, etc.)
  3. Click "Extract Audio" button
  4. The audio file will be downloaded automatically
  5. Verify the output file in your device's download folder.
  6. You can adjust settings and process new files immediately without any restrictions.

All processing is done in your browser, and files are never sent to a server.

Frequently Asked Questions

You can extract audio to MP3, WAV, or AAC format.
The extracted audio quality depends on the chosen output format. WAV preserves the highest quality.
Yes, it supports all major video formats including MP4, AVI, MOV, and WebM.
If extraction fails: (1) confirm the video contains an audio track, (2) use a file under 500MB, (3) convert the video to MP4 first, (4) refresh the page and retry.
No. All operations are processed entirely inside your browser's local sandbox using client-side APIs (like WebAssembly, pdf-lib, or HTML5 Canvas). Your files and data never leave your device.
The tool is completely free with no usage limits. However, since processing occurs in your browser's memory, we recommend keeping file sizes under 50MB (especially for heavy files like PDFs or videos) to ensure stability.
No. All tools on ConvertBox are 100% free. We do not insert watermarks, limit features, or require any registration or payment.
Yes. Once the page and its local library dependencies are loaded in your browser, the conversion logic runs completely offline without needing an active internet connection.

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