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Online Image Optimizer- GIF, JPG, and PNG Image Optimizer lets you easily optimize your gifs, animated gifs, jpgs, and pngs, so they load as fast as possible on your site. Furthermore, you can easily convert from one image type to another. Upload Size limit: 300 kB
Online Image Optimizer: Optimize your GIFS, JPGS, and PNGS onlin
If you haven't tried making panoramas before, this is the place to start. If you have, you should find this the easiest and best way of making them.