Freeware
Vista / Win7 / Win8 / WinXP
4K Video Downloader is a freeware tool to download videos from YouTube and convert them for specific devices.
For example, the tool can provide video for iPhone or iPad. The application is completely free.
To download a video, all you need to do is copy and paste a URL into the application.
Screenshots:
Download:
http://www.afterdawn.com/software/general/download_splash.cfm/4k_video_downloader