MPEG-4 Part 14 or MP4, formally ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4. Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). And, beware of the false convert button (ad) placed beneath the real download button.MP4 files (MPEG-4 Part 14) are multimedia files. It is not compatible with the iPad or iPhone as well. YTMP3 does not support video longer than 1 hour. There are several restrictions using YTMP3, though. However, if you care more about the speed and convenience, this site remains a nice place for you. If you have high-demand for the audio quality, this site may not be the best choice for you. (We tested it with an MP3 320kbps song, and the converted result is in 192kbps). But we found that it can only convert audio to half of the original audio quality. YTMP3 claims to auto-convert YouTube to MP3 in the highest quality available. You can also choose to download your video as either MP3 or MP4. And then, you are offered choices as to download, save to Dropbox, or continue to convert the next video. Secondly, the conversion is fast and usually takes one or two seconds. Firstly, the self-explanatory interface of YTMP3 puts no pressure on its users to start a conversion of their desired YouTube videos instantly. Their supports for this converter have reasons. YTMP3 is regarded by some users as the best free YouTube to MP3 converter online.

No ads, no malware, 100% safe and easy to use.

Also support downloads from Facebook, Twitter, and many other sites.

Download SD/HD/4K/8K videos from YouTube.

Save full YouTube playlists and channels at once.

YouTube to MP3 no size limit and no time limit.

It should take only a few seconds for the audio conversion. If that happens, you can first save the video as one of the available audio formats and then convert it to MP3 with the built-in Converter. Note: Sometimes you may not find the MP3 download option when using this software.

On top of that, it is a YouTube converter with no limit, meaning that you can save YouTube to MP3 no length limit and no size limit. Meanwhile, it also offers to convert YouTube to MP4 and other formats, download YouTube playlists/channels and more.

It features an advanced YouTube converter that would make your YouTube to MP3 conversion a breeze. WonderFox HD Video Converter Factory Pro is the best YouTube music downloader software available for Windows users.

Best mp4 to mp3 converter free download