XnView is freeware software that allows you to view and convert graphic files. It's very fast and easy to use.
XnView is a utility for viewing and converting graphic files.
XnView is a fast multi-format graphics browser, viewer, and converter. It can read more than 400 file formats, e.g. GIF, BMP, JPEG, PNG, TARGA, multipage TIFF, camera RAW, JPEG 2000, MPEG, AVI, Quicktime. EXIF and IPTC metadata are also supported. The image viewer has an Explorer-like browser that allows quick and simple browsing of directory contents. XnView supports red eye correction, crops and transforms JPEG images losslessly, generates HTML pages and contact sheets, and provides batch conversion and batch renaming. Slide shows with transitions effects, screen capturing, WIA and TWAIN support (scanner and digital cameras), image comparison, file operations.
This free program provides a number of helpful tools for working with digital photos. XnView's pane interface shouldn't disorient most users, as it uses a tree-like structure to let you view your shots and browse your music collection.
You will find many detailed tips and information on image formats in the FAQs of the XnView Forum at http://forum.xnview.com.