YouTube Videos Convert To High Quality

Step1: Click to video that you want to see, the link will display on Address bar. E.x: http://in.youtube.com/watch?v=_NrA28oo_ZQ

Step2: Add &fmt=6 to the end of that string. That address like:
http://in.youtube.com/watch?v=_NrA28oo_ZQ&fmt=6

Enjoy your Video Now IT HIGH Quality Video

Step3: Add &fmt=18 to the end of that string, you'll have the best quality video with direct download link !
http://youtube.com/watch?v=9BNJwPFJ0Os&fmt=18

Note: Appending &fmt=6 to the URL delivers a 448x336 resolution version of the video and appending &fmt=18 delivers a even better 480x360 resolution version.