FastStone Photo Resizer
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Full user review
"Quick painless way resize and rename photos in bulk"
Simple user interface
Washes out the colors during resize
If you want to reduce the size of a bunch of photos in one quick this will do the job. That being said, I did notice degradation of color saturation. The images went from Adobe RGB color space to Untagged RGB, significantly lessening the color saturation, which was highly visible in side by side comparisons of original images to resized ones. But I do recommend it for resizing for the web or email.