FastStone Photo Resizer is an image converter / resizer intended to enable users to convert, rename, resize, crop, rotate, change color depth, add text and watermarks to images in a quick and easy batch mode. Drag and Drop mouse operation is well supported.
Features:
Convert and Rename images in batch mode
Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000
Resize, crop, change color depth, apply color effects, add text, watermark and border effects
Other Thoughts: Two thumbs up. And, it's free. I'm a professional photographer and I downsize hundreds of photos everyday. It beats AC-DSee hands down. Highly recommended.