How to Convert YouTube to MP3 Using 4K Video Downloader If you want to convert a YouTube video on your Windows or Mac computer, you can use 4K Video Downloader, YouTube to MP3, or MediaHuman YouTube to MP3 converter. There are lots of free and paid tools you can use to download and convert YouTube videos to MP3 format. Convert YouTube to MP3 on Windows and Mac With these caveats in mind, let’s look at how you can convert your favorite YouTube videos into MP3 or audio files for use on different devices. Before using any such site or tool, make sure you have a strong antivirus that’s running the latest update and virus definitions. Plus, you should choose a tool based on its ability to preserve the audio quality, availability of various media formats, and fast download.