7 SITES TO DOWNLOAD YOUTUBE VIDEO IN HD+1 SHORTCUT

video resolutions are as:
720p ¨C 1280¡Á720 pixels @ 50/60Hz Progressive
1080i ¨C 1920¡Á1080 pixels @ 50/60Hz Interlaced
1080p ¨C 1920¡Á1080 pixels @ 24/25/50/60Hz Progressive When you go to download videos using these sites, some of these sites will install an application that will let you download videos seamlessly.
Install them on your own risk.

(1) Clipconverter.cc
This is a new website and download YouTube videos in HD. It is very fast to convert a video from YouTube. It is also a video converter, you can convert videos by uploading too. After downloading you can watch videos on your favorite device.


(2) Keephd.com
It is a good tool and famous one for YouTube videos in HD. You can download HD videos and other video formats as well3gp and flv. It supports some other sites as well.

(3) Keep-Tube.com
This is a HD YouTube video downloader, you can also use greasemonkey and Firefox add-on. It also supports other video sharing sites.

(4) Savevid.com
It is an interactive website, on this website you can see live videos that other users are downloading via this website.

(5) Youtubesnips.com
You can download YT videos in three different formats are as 3gp (fro mobile), flv (lower quality) and MP4 (HD). You can use this tool to download videos directly or you can use their bookmarklet and URL interface is by default.

(6) Forinside.com
It is also an online video converter, so you can use this tool to convert a video by uploading going to file menu. To download a video you have to copy and paste a video link. This site also support other websites but YouTube is by default and HD format is also by default.

(7) TubeZen.me
It let you download videos in 3Gp, Mp4, HD, Flv, Mp3 and Wmv. You can search videos on this site and download.

FOR MOBILE !

(1)clipconverter.cc
This site is best for mobile.

(2)Vuclip.com

(3)Tubidy.com 

SHORTCUT:

Just add ss before your youtube video
For example if you want to download this video

http://www.youtube.com/watch?v=4LDwoz9LD6g  

then add ss before the link like
http://www.ssyoutube.com/watch?v=4LDwoz9LD6g 

it will redirect to other page and then you can download.