Magic Image Resizer is used to resize pictures in all most popular graphic formats. It resizes them in batch mode, which means that the user can select hundreds of images, select desired size and just click the Resize button. The images will keep the original aspect ratio so you don't have to worry about weird sized pictures you see on some web sites. The resized images get stored in a subfolder.
This is good news, because you will keep the original sized photos and will never accidentally overwrite them. The program is Free to Try so make sure you download this easy-to-use yet very powerful tool now. Version 1.1 may include unspecified updates, enhancements, or bug fixes.