Youtube now supports HD videos officially and we have already discussed how can you embed HD resolution videos on webpage/blog. Whereas, there is no default option to Download these videos in HD format or quality that you want.
KeepHD is a online service which lets you download HD copies of the videos available on Youtube. Not only HD but also in 3GP and MP4 format which is playable on most Mobile handsets. Not to forget FLV format (default) of low quality option is also available in addition.
Note : Not all videos have their HD version on Youtube because the video should video must meet Youtube’s requirements listed here. So, It may happen that you don’t always get an HD video download.
