Quick answer: To convert MP4 to MP3, add one or more videos, choose the bitrate (192 kbps for music, 128 kbps for speech) and download the MP3s, or all of them as a ZIP. The conversion runs on your device, including Safari on iPhone.
Turn an MP4 into an MP3 that plays in every music app, car and speaker. Choose the quality, convert a whole batch at once, and nothing gets uploaded.
MP4 to MP3 at a glance
| Price | Free, no sign-up, no watermark, no daily limit |
|---|---|
| Accepts | MP4 · M4V |
| Largest file | 2 GB per file, several files at once |
| Where it runs | In your browser: files are never uploaded |
| Works on | Any modern browser on iPhone, Android, Windows, Mac and Linux |
| Send the result | Download it, or send it free with a link or by email (up to 20 GB) |
How to convert MP4 to MP3
- Choose one or more MP4 files.
- Pick the MP3 quality: 192 kbps is a good default, 128 kbps for speech, 320 kbps for music.
- Press Convert to MP3.
- Play the MP3 on the page, then download it.
Choosing an MP3 bitrate
| Bitrate | Good for | Per minute |
|---|---|---|
| 128 kbps | Speech, podcasts, lectures | 0.96 MB |
| 192 kbps | Most music | 1.44 MB |
| 256 kbps | Music on good headphones | 1.92 MB |
| 320 kbps | The highest MP3 quality | 2.4 MB |
A higher bitrate cannot add quality that the video's sound did not have: phone videos usually carry 128 to 256 kbps AAC, so 192 or 256 kbps MP3 keeps everything.
How the conversion works
An MP4 holds a video track and a sound track, usually AAC. The tool reads only the sound track, decodes it with your browser and encodes it with LAME, the reference MP3 encoder, compiled to WebAssembly. It runs many times faster than real time, and the video part is never decoded. Song titles and other tags in the MP4 are carried over where MP3 supports them.
Prefer an Apple-friendly file with no re-encoding? Extract the audio as M4A.
Private, free and unlimited
There is no daily limit, no queue and no sign-up, because the work happens on your own device. Your files are never uploaded.
How this compares
| This tool | Online converters (e.g. Online Audio Converter, Clideo or CloudConvert) | Desktop apps (e.g. Audacity) | |
|---|---|---|---|
| Your file is uploaded | No | Yes, to their servers | No |
| Install or account | None | Account for some features | Install needed |
| Watermark or daily limits | None | Common on free plans | Depends on the app |
Plans of other services change; check their sites. More audio tools.
Frequently asked questions
What is the best bitrate for MP4 to MP3?
192 kbps suits most music and 128 kbps suits speech. Going above the quality of the original sound does not help.
Can I convert several MP4 files to MP3 at once?
Yes. Add them all and download the MP3s together as a ZIP.
Does it work on iPhone?
Yes, in Safari: choose the video from Photos or Files and save the MP3 to Files.
Are my files uploaded?
No. The conversion happens in your browser.
Need to send a big file?
Send files up to 20 GB with a download link or by email. Free, no account needed, original quality.
Send large files free