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Convert MP4 to MP3 in your browser

MP4 is the most common video container; this page is tuned for it. Drop an .mp4 and get a clean 192 kbps MP3.

Runs in your browser Free No sign-up
  1. Choose file
  2. Set options
  3. Get result

Your file never leaves your device. Processed locally with WebAssembly. Nothing is uploaded.

MP4 to MP3 on any device

Recorded on an iPhone, Android, GoPro or Zoom? Those files are MP4 (or MOV, which is closely related). GustKit reads the AAC track inside the MP4 and encodes it to MP3 with LAME, all inside the browser with no app to install.

Tips for large MP4 files

Desktop browsers handle files of several hundred megabytes. On phones, close other tabs first so the browser has enough memory. If you only need the audio for an Apple device, choose M4A: it copies the original AAC stream and finishes almost instantly.

Frequently asked questions

Is there a watermark or time limit?

No watermark. The free plan accepts files up to the size and duration limits shown in the tool.

Will the MP3 keep the full length?

Yes, the whole audio track is converted. Nothing is trimmed.