Youtube is the most popular video sharing site today and holds loads of videos. Even most of your favourite videos can also be found on Youtube. So it is very common if you need to save a video with you for repeated playback.
Videos from Youtube can be downloaded in many ways like using some desktop clients or using the websites like keepvid.com but with this called Youtube Snagger you can even download the video in HD format too.
Youtube Snagger is a video downloader that can be used to download videos from Youtube in HD format. The HD format of the video will solely depend on its availability. Videos downloaded will have either the .flv or .mp4 format depending on the quality and the availability.
The tool is free to use and works on Windows but requires .Net Framework 3.5 in the system for the installation. You can see the preview of the tool on Youtube as well.