Convert mp4 to mp3

How can I convert mp4 file to mp3? It is super easy at tagmp3.net like just upload your mp4 file, and download your mp3 file. You can upload single, or multiple files at the same time. The conversion process just takes time like close your eye and then open ;)
Sounds simple? Yeah, it's exactly like that, so start uploading your mp4 file(s) below and enjoy!