You can download and convert longer playlists to MP3 format if you buy a license key, but the software's free features are very impressive. It lets you download up to 24 videos in a playlist, which is particularly useful for grabbing several songs by a particular artist. The free version of 4K Video Downloader does have its limitations, but we find that it suits most people just fine. Select 'Extract audio' and pick MP3, OGG or M4A, then click 'Extract' and the audio will be converted and saved to the destination of your choice. Copy the URL of a video from your web browser (it supports YouTube, Vimeo, Facebook, Flickr and DailyMotion) and click 'Paste URL'. It works in a similar way, too, but because this app is chiefly for downloading whole videos, there are a couple of extra steps involved. It might not be the most stylish software around, but like 4K YouTube to MP3 above, 4K Video Downloader is brilliant.