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MP4 to MP3 Online Free — PrivaTools

TL;DR: Upload an MP4 video and download just the audio track as an MP3 file.

Convert MP4 to MP3 online for free — extract the audio track from any MP4 video and save it as an MP3 file. Perfect for music videos, podcasts, and recorded lectures.

MP4 to MP3 is one of 179+ free file utilities on PrivaTools. The entire stack is open source under the MIT license, so the privacy guarantees can be audited end-to-end. You can also run all 179 tools on your own infrastructure with one docker compose command.

How to Use MP4 to MP3

  1. Upload an MP4 video — Drop an MP4 file up to 200 MB — music videos, lecture recordings, podcasts, anything with audio.
  2. Extract audio and download — Click Convert. PrivaTools extracts the audio track and re-encodes it as MP3, perfect for offline listening on any device.

Frequently Asked Questions

Does this work for any MP4?

Yes — as long as the MP4 has an audio track. Music videos, lecture recordings, podcasts, screen recordings with narration, all work.

What about file size?

MP3 audio is dramatically smaller than the original video. A 1 GB video file typically becomes a 5–15 MB MP3.

Is the video kept?

No — only the audio track is extracted. If you also need the video, keep the original MP4.

Last reviewed 2026-05-01 by the PrivaTools maintainers. Source code on (MIT-licensed, self-hostable).

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