MP4 to MP3,
without the upload.
Drop a video, get its audio as an MP3. The conversion runs in this tab, so a 2 GB file takes no longer to start than a 2 MB one.
free, always
MP4, MOV, M4V, WebM. The file never leaves your computer; conversion happens in this tab.
Choose a fileWhy it runs in your browser
Uploading a 400 MB video to extract a 4 MB audio track is a waste of your time and ours. Your computer already knows how to decode the file.
The browser reads the audio track out of the video with the same engine it uses to play it.
MP3 is encoded in JavaScript on your machine. Larger files take longer, but nothing is sent anywhere.
A normal download from your own tab. Close the page and the data is gone.
An MP4 to MP3 converter that is just a web page
Every mp4 to mp3 site works the same way: upload, wait, download, and hope the file is deleted afterwards. The upload is the slow part, and it is unnecessary. Your browser already contains a full media decoder. This page uses it to read the audio track out of the video, encodes an MP3 in JavaScript, and hands you the file. Nothing touches a server.
Use it to pull the audio out of a recorded Zoom call, a lecture, a music video you own, a voice-over you recorded on your phone camera, or a clip you want to transcribe without sending the whole video anywhere.
Limits worth knowing
- Browser codecs only: MP4/MOV with AAC audio always work; exotic containers may not.
- Memory-bound: multi-gigabyte files can fail on phones.
- No trimming or batch yet. One file at a time.
Related
Video to audio is the same engine with WAV as the default. Need text from the audio? Transcribe audio to text.
Questions
Can I convert MP4 to MP3 on my phone?
Yes, in the browser, including iPhone Safari. Large files can run out of memory on phones; files under about 500 MB are usually fine.
Is my video uploaded?
No. Decoding and encoding happen in your browser tab. You can disconnect from the internet after the page loads and the conversion still works.
Why did my file fail to decode?
Browsers only decode codecs they can play. MP4 and MOV with AAC audio work everywhere; MKV, AVI and some camera formats may not. Firefox cannot decode some AAC variants. Try Chrome or Safari, or convert the file to MP4 first.
Is there a file size limit?
The whole file is read into memory, so very large files (several GB) can fail on phones or low-memory laptops. Anything under an hour of 1080p is normally fine on a desktop.
Does the quality drop?
MP3 at 192 kbps is transparent for speech and most music. Choose 320 kbps for music you care about, or WAV for a lossless copy of the decoded audio.