XnView is an image organizer and general-purpose file manager used for viewing, converting, organizing and editing raster images, as well as general purpose file management. It comes with built-in hex inspection, batch renaming and screen capture tools.
1. Import about 400 graphic file formats.
2. Export about 50 graphic file formats.
3. Multipage TIFF, Animated GIF, Animated ICO support.
4. Image IPTC, EXIF metadata support.
5. EXIF auto rotation support.
6. IPTC editing.
7. Resize, rotate, crop support.
8. Lossless rotate & crop (jpeg) support.
9. Adjust brightness, contrast.
10.Auto levels, contrast
11.Modify number of colors
12. It's very fast and easy to use.