There's a good web page on when to use .gif and when to use .jpg : http://info.med.yale.edu/caim/manual/graphics/graphics_summary.html In fact, the whole site is very good for HTML. If you need to slim down a couple of pages worth of images, visit: www.gifwizard.com You can get up to 5 pages worth of images scanned and compressed for free. You can buy a 1 year membership for a reasonable price, which allows you unlimited compression for one web site.