How to use the MP4 to MP3
- Add your .mp4 video.
- MP3 is preselected. Choose the bitrate.
- Press “Convert” and download.
Use your own content
Only convert videos you own or have permission to use. This tool works with files on your device; it does not download videos from websites.
How the converter works
Conversion uses FFmpeg, the widely used open-source media engine, compiled to WebAssembly so it runs inside your browser. The first time you convert, your browser downloads the engine (about 30 MB) from a public CDN; after that it is cached. Your media file itself is not uploaded.
Because the work is done by your own device, long videos can take a while, especially on phones. Files up to 500 MB are supported; for best results on mobile keep files under 100 MB.
Frequently asked questions
How do I convert MP4 to MP3 in the best quality?
Choose 320 kbps before converting. That is the highest MP3 quality; 192 kbps is enough for most music and 128 kbps for speech.
Can I convert MP4 to MP3 on Android or iPhone?
Yes. Open this page in your phone’s browser, pick the video from your gallery and download the MP3. No app is needed.
Can I paste a YouTube link?
No. The converter only works with files on your device.
How big will the MP3 be?
About 1 MB per minute at 128 kbps, or 2.4 MB per minute at 320 kbps.