MP4 to MP3

How to use it

1. Pick a bitrate.
2. Add your video files.
3. Download the MP3s.

Good to know

The whole audio track is held in memory during the conversion, so videos of several hours work better on a computer than on a phone.

Support for less common audio codecs inside MP4 varies by browser. If one fails, try Chrome.

Choosing a bitrate

File size depends only on bitrate and duration, so you can work it out in advance.

A higher bitrate cannot add quality

Audio in an MP4 is usually already compressed, typically as AAC. Converting to MP3 compresses it a second time, so there is a small loss whichever setting you choose. Going above the original bitrate makes the file larger without improving the sound. If you do not know the source, 192 kbps is a sensible choice.

If the conversion fails

• No audio found: the video may have no sound track at all. Check that it plays with sound in a media player.
• Some video files use audio formats such as AC-3 that browsers may not decode. Trying another browser can help.
• Very long videos need a lot of memory, so a computer is a better choice than a phone.
• .mp4, .m4v and .mov files are accepted. Links to online videos are not.

Use it on files you are allowed to use

Your own recordings, meeting captures and footage you have permission to reuse are all fine. The tool handles only files already on your device, and it cannot open DRM-protected videos.

Questions