resizing icons

I'm trying to find a faster way to resize icons that I've dloaded. Is there any program that resize multiple files at once or I'll have go trough 1 at a time?
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Photoshop does all at once
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Thanx man. but how do I do it. I've tried but only changed the active window.
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here is the tutorial to do it

Thanx again man ur a lifesaver
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1 last question, does resizing a small to larger to larger say, 46x38 for pearl to 73x73 for storm cause them to blur? im having hard time trying that, It only works goin from 80x80 to 73x73.

yes it does, you should go from lets say 80 to 73 otherwise you will get blur images, what i usually do is just enlarge the canvas and kept the images the same size

for example an 48x36 px image i just enlarge the canvas and center the image