savetomp3.co is an online service the most simple and the fastest. You only need to type a name or copy a youtube URL into our search bar to download any videos to mp3. Moreover, we also provide you the ability to cut your video from a timeline, to listen it directly on the website, to discover new music with the top list by country !
You can follow this tutorial : How to download music from Youtube to mp3
Yes, STM is free and will remain free, no matter what.
savetomp3.co doesn't store any files on its servers and doesn't publish any links. If in any case, you may have issue about Copyright, please contact Youtube administrators.
There is no law against that for the moment. We are only converting a data stream into a mp3 file.