1. ListenToYouTube
http://www.listentoyoutube.com is the most famous free YouTube to MP3 converter online. No signup is needed. Simply copy and paste the YouTube video URL and it will download the Flash video to its server. After the downloading, it will extract the MP3 audio files and give you a download link to get the MP3 files. However, sometimes the quality of the MP3 files is not as good as you've expected.
Tips: If you want to listen to YouTube videos on your MP3 player with the help of a desktop YouTube video to audio converter, please visit: Listen to YouTube by Converting YouTube Video to MP3.
2. Video2MP3
http://www.video2mp3.net is another great free online YouTube to MP3 converter that is quite easy to use. It claims to be the most reliable free YouTube video to MP3 converter online over the web. Most of the popular video services providers like Dailymotion, MyVideo, etc. are well supported. Simply copy the video link to the converter box and you'll get the MP3 files in a few minutes. What's more, this tool allows you to choose the quality to your needs.
3. YouTube MP3
http://www.youtube-mp3.org is probably the easiest free online YouTube video to MP3 converter. (As you see, the web design is quite simple and intuitive.) Enter the YouTube video URL you'd like to rip MP3 audio from and then click Convert to start to extract MP3 audio files from YouTube Flash videos with high quality. One thing to mention is that this web service is platform independent, which means that you can use it on a Mac, a PC or even an iPhone.
