Here is a quick list of major free service offering online Video to GIF conversion :
- GIFSoup - one of the most popular service offering creation of animated GIFs from YouTube videos with options to include just a specific portion of video. This site needs compulsory registration before allowing conversion but is by far the best option to convert Youtube videos into animated images.
- Gickr - Create GIF animations by uploading pictures from your PC, Flickr and YouTube videos.
- GIFNinja - Offers animated GIF conversion from avi, mpg, mpeg, mov, 3gp, flv, wmv, asf and mp4.