XnViewMP: FREE software for reading, viewing, and processing all your images.
XnViewMP is the enhanced version to XnView. It is a powerful cross-platform media browser, viewer and converter. Compatible with more than 500 formats.FEATURES
• Easy to use yet powerful batch conversion module. This same module also powers XnConvert.
• Supports more than 500 image formats (including Multipage and animated still formats APNG, TIFF, GIF, ICO, etc..) and export to about 70 different file formats.
• Choose Installer Setup or just download the zipped program folder and use as a Portable software: Just unzip and run.