Download FastStone Photo Resizer
If you want to convert many images into different formats at the same time, FastStone Photo Resizer is the application you need to do so. It supports several kinds of formats such as: JPEG, BMP and GIF. It has a simple but very reliable interface, excellent to rename a whole set of pictures at once.
It comes with many useful editing tools such as changing the size of your photographs, quality improvements and change the color and tone of your images.
FastStone Photo Resizer is fast and user friendly. You can fully customize this program by changing its skins and it's completely free! Isn't that awesome?