Extract Audio from MP4 — Convert to MP3 Online

Pull the audio track from any video file and download it as an MP3.

How It Works

  1. 1Upload your file by dragging it into the drop zone or clicking to browse.
  2. 2Adjust the quality slider to balance file size and visual fidelity (optional).
  3. 3Click Download to save your converted file.

About MP4 to MP3

Want just the audio from a video? Upload your MP4 or other video file and extract the audio track as an MP3 with your preferred bitrate. Perfect for saving music from videos, extracting podcast audio, or converting video lectures to audio-only files. Uses FFmpeg.wasm to decode the video and encode the audio stream, entirely in your browser. Your files never leave your device.

Frequently Asked Questions

What bitrate should I choose?

128 kbps is fine for speech and podcasts. 192 kbps is a good balance for music. 256-320 kbps provides near-transparent quality for audiophiles.

Is my file uploaded to a server?

No. Transmute processes everything locally in your browser using JavaScript and the Canvas API. Your files never leave your device — there is no server, no upload, no cloud processing.

Can I extract audio from non-MP4 videos?

Yes! Despite the name, this tool accepts MP4, WebM, MOV, AVI, and MKV files. Any video with an audio track can be converted to MP3.

What if the video has no audio?

FFmpeg will report an error if there is no audio stream to extract. Make sure your video file contains an audio track.

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