It's not through a site.. it's by actually making it. This might help: 1 second of video is equal to 4 still pictures. That's how a camera works. It takes 2-5 stills per second so when there is movement it's captured by each still then when played it looks like motion. What kind of a video do you want to make? If your on Windows then you can try Movie Maker it usually comes with xp but it's really buggy and doesn't do what it's suppose to half the time. If your on a Mac try iMovie. If you're on Linux then get a graphic distro.(There are free one's out there).