Features we need to look for in any YouTube video downloader tool are the follows: 1. Quality of the video - It allows you to download videos with all types of quality like low, medium, and high. 2. Download speed - It should quickly grab and download the video even you have a poor internet connection. 3. Subtitles - It should allow you to download subtitles along with the video. 4. Playlist or Channel Download - It should support batch downloading features like a complete playlist or channel download feature. 5. File support - It should allow you to download the video in multiple formats like MP4, MP3, AVI, etc., 6. Private Video Download - Using most of the tools, we cannot download almost all the videos mostly private videos. Tools like Snapdownloader supports this feature. 7. Video Editor - It should allow you to edit and download some parts of the video.