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ConvertBox

Video to Audio

Extract audio from MP4, MOV, WebM and AVI videos. Save as MP3, WAV, AAC or FLAC, pick bitrate and trim — processed locally with FFmpeg.wasm.

How to Use

  1. Select a video file to extract audio from
  2. Select the desired output audio format
  3. Click the "Extract" button
  4. File will download automatically once finished

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

Frequently Asked Questions

Yes, this tool serves the same purpose — extracting the audio track from a video file.
MP3 is the most universally compatible. Use WAV for lossless quality or FLAC for lossless compression.
This tool works with locally uploaded video files only, not URLs.
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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