Regular jpeg files are pretty tight themselves, but several good programs exists to make the compression better and more efficiently (like IrfanView already mentioned - an excellent program all in all). Xat.com's Image Optimizer (free trial download at the link) allows special tricks such as area compression (part of the jpeg standard, but so hard to implement that major image-editing software packages are disregarding the option) in which only unimportant parts of the image (user selects) are more heavily compressed. Optimizer can also do artifact removals, noise reduction, watermarks etc. http://www.xat.com/io/index.html