PicuSizer is a free, powerful and easy-to-use software application to batch convert and write images. PicuSizer supports many image formats including formats like GIF, JPEG, JPEG-2000, PNG, BMP. 

Clicking the right mouse button while the mouse cursor is over the image you will convert all images to chosen format or, alternatively get pop-up menu. It contains various items for controlling how the image in that view is displayed. PicuSizer allows you to easily add thousands of images to be converted, and with a single click. 

The conversion and re-sampling of images is based on the unique algorithms that enable recognition of arbitrary objects and re sampling based on current image quality. This tool is very easy for novice user as well as very power for most experienced professional.