YouTube, DailyMotion, Megavideo, Metacafe, and Vimeo are just a few of the sites compatible with KeepVid. Copy the URL of the video you want to download, head to KeepVid.com, and paste it in the bar at the top. Then click Download to the right of that bar. Do not click the large green Download button.It will load for a few seconds, then you'll have the option to download the video in FLV (Flash), MP4, or WebM format.ouTube, DailyMotion, Megavideo, Metacafe, and Vimeo are just a few of the sites compatible with KeepVid. Copy the URL of the video you want to download, head to KeepVid.com, and paste it in the bar at the top. Then click Download to the right of that bar. Do not click the large green Download button.