Source from: http://www.videoconv...lternative.html
If you want to save YouTube as MP3 format, you can take Convert2mp3. It is a free site that allows you to download and convert online videos from YouTube, Dailymotion, and Clipfish. It is able to keep online videos as MP3, M4A, AAC, FLAC, OGG, WMA, MP4, AVI, WMV and 3GP. Besides, you don’t need to register an account to make sure the downloading function works well.
Still, there are some limits. Sometimes you may find that this site would not work. Also, it does not support to download 4K and 8K online videos. And if you download online videos via convert2mp3 add-on, you are not allowed to choose resolution since it will download 720P videos by default. And network speed takes a great part in the downloading. Moreover, this site can only download from three sites and the output formats are limited.
So here will list some alternatives to get rid of these problems. Since there are more and more online video downloading sites like keepvid, clip converter, offliberty and so forth. You can take one of them to save YouTube as MP3 format easily. If you expect to download the video from more sites, keepvid is a good choice and it can also download subtitles; if you want to save videos as more formats, then choose clip converter (this site even supports to download 4k videos); if you want to download videos with simple steps, go to offliberty.com.
These are some similar sites, and there’s one more safe and fast way – take offline video downloader: HD video converter factory. It is a freeware that is capable of downloading videos with three simple steps: copy and paste video’s link > Analyze > Select one format/resolution then start to download