Made Good Designs

MP4 to MP3

Convert MP4 to MP3 online for free — extract the audio from any video at 96 to 320 kbps, trim it to the part you need, add fades and normalise the volume. Works with MP4, MOV, WebM and MKV too. Everything runs in your browser, so your video is never uploaded.

100% private — everything runs in your browser. Conversion happens on your device; nothing is uploaded.

100% private — runs in your browser

Your browser decodes the audio and an open-source MP3 encoder (LAME, via lamejs) converts it on your device — nothing is uploaded. Works with MP4, MOV, M4A, WebM, MKV, WAV, OGG and more; very long files need plenty of memory, so trim if your browser struggles.

How to convert MP4 to MP3

  1. Drop your MP4 video in the box.
  2. Choose the MP3 quality and stereo or mono.
  3. Optionally set start and end times, fades or normalising.
  4. Click Convert to MP3, preview it and download.

What you can use it for

  • Save the audio from your own videos, talks and lectures
  • Turn screen recordings into podcast episodes
  • Extract music or voice-overs from video projects
  • Make MP3s for phones, cars and audio players

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Frequently asked questions

How do I convert MP4 to MP3?

Drop the MP4 in, choose a quality and click Convert to MP3. When it's finished, preview the audio and click Download MP3.

Can I convert other video formats?

Yes — MOV, M4V, WebM and MKV work too, as long as your browser can decode the audio track (Chrome and Edge support the most formats).

Which quality should I choose?

192 kbps sounds excellent for music and keeps files small; 320 kbps is the highest MP3 quality. For podcasts and speech, 96–128 kbps in mono is plenty.

Can I convert just part of the file?

Yes — set a start and end time (minutes:seconds) before converting. Fade in and out smooths the cut edges.

Is there a file size limit?

There's no upload limit because nothing is uploaded, but the whole file is decoded in your browser's memory. Files up to a few hundred MB work well on most computers; for very long recordings, convert in parts.

Is my file uploaded?

No. Decoding and MP3 encoding both happen on your device.

Can I convert YouTube videos?

This tool converts files on your device. Only download and convert videos you own or have permission to use.