Follow the Very simple steps:
1. Go to YouTube, Open the video that you want to download
2. Now you have to make a small change in video link [Replace "www" to "ss"]
For example youtube.com/ watch?v=xxxxxx
ssyoutube.com/ watch?v=xxxxxx
3. After it will redirect to a new site http:// en.savefrom.net/
4. Now you have to choose the format of the video like mp4, 3gp, flv.
5.That's itttt i hope you like it.