Is there any way you can download youtube videos for free on the iPhone?

I'm trying to make a gif using gifboom, and I need a part from a youtube video.

http://keepvid.com/

Copy url from youtube paste to the site

If it don't works you might need to download it on computer and move it to your phone

Jailbreak it and download the app MXTube from cydia.

1 goto http://lorbase.com and just paste the youtube video url
2 click download.
3 video links will showup and right click save as

Many friends of mine and i are using Any Video Converter Free to download youtube videos and convert them to iPhone as the output profile. You need not to worry about the problem of files can't be opened or some other problems. Very convenient and work well. And of course, it is free!