XnShell is a free shell extension for Windows Explorer that adds many image editing and image conversion functions to Right click menu. By right clicking on any image, you can see a preview of the image, change format, rotate image, copy image to clipboard, send image to ImageShack, set image as wallpaper, and more. Just right click on any image and perform all these tasks easily.
XnShell is very nice. When I installed it, I was a bit apprehensive about what all features it would have. But I find it very useful, feature rich, and easy to use. Right clicking on image is all it takes. Just imagine, you can change format of any image by right clicking on it, without a need to install stand-alone image converters.
When you right click on any photo, you will see an option “XnShell”, as seen in screenshot above. Just expand that option to see all the options available. As you would notice from the screenshot above, it also shws a nice preview of the image on which you have right clicked.
XnShell : http://goo.gl/nGRQY