FastStone is a free image viewer. With the software FastStone you can edit and convert images, as well as browse between all of them. The program is for free, so you don't have to pay anything for it (its a freeware). You can get FastStone on the site faststone.org.

There is a short description of the software and a direct link to download. There are also marked the formats which the program supports. For example, it supports JPEG, BMP, GIF, and so on.