WonderFox Free HD Video Converter Factory can not only convert video and audio files, but also edit videos for sites like YouTube. It has a handy video editor that can quickly trim, crop, merge, and efficiently rotate and flip YouTube videos. Also, it can download video and audio files from YouTube, Facebook, Twitter and more than 1000 video sharing sites. Best of all, this program is completely safe and free to use. Download the freeware and try it out!