Part 2: YouTube to MP3 Converters for Windows and Mac.Part 1: Best Free Online YouTube to MP3 Converters.Therefore, this article will show 10 best free YouTube to mp3 converters for you to convert a YouTube video to mp3, on both Windows and Mac. Then you can always listen to music or audio whenever you want. How about you? Instead of tapping the frequently used links on the YouTube platform, you can convert YouTube to mp3 by using a YouTube to mp3 converter. Hey, when you find a wonderful or dramatic song or music in a YouTube video, what would you like to do? For me, I want to download it and listen to it when I’m offline.