Make Use Of authors have covered a wide spectrum of online and desktop image batch-resizing programs, sadly none of them were Mac-specific. Luckily, I found this small but handy application which was born and bred for the task.
Previously, when I needed to resize an album of images, this is what I had to do:
Doesn’t sound like much but trust me, after a few hundred images, you’re bound to get tired of it.
Online image re-sizers aren’t an option for me because I shoot a couple of hundred of photos per session and they’re all taken at maximum resolution which is 12.1 MP. So, uploading and re-downloading those photos aren’t technically time-efficient.

Cue Pixer. It’s a relatively unknown application by a small Italian company called 1802. They make lightweight applications which are simple and perform a minimal number of tasks, so they’re pretty specific to what they do. Pixer is an image batch-resizer with a little bit extra on the side.
In addition to resizing your photos, you can also:
Pixer is very versatile in the sense that it supports almost all image formats [PNG, JPG, TIFF, PSD, BMP, PICT and RAW(only in Leopard)]. After processing your images, Pixer will insert a pre- or postfix on the resulting files to differentiate them from the originals.
At the end of every operation, the application will ask you if you would like to visit their website, which can be annoying. However, if you donate to 1802, apparently they will send you an email and a little program attached which will rid you of that nuisance.

In the end, it is a small price to pay to see a tiny application like Pixer work as marvelously as it does.
Pixer is Universal Binary, charityware and available for Tiger and Leopard.
If you’re wondering which articles I mentioned at the beginning of the article, here are the links:
Resizr - Quick way to Resize Images Online
Picresize : Quick Web-based Photo Editor
My-I-Size : Resize GIF, PNG and JPG Images Online
QuickThumbnail : Resize Images Online
FixPicture: Resize and Convert Images Online
Resize2Mail : Quick Image Resizer
Dosize : Multiple Image Resizer
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Filed Under: Cool Software Apps ¦ Mac
Tags: image, image resizer, Mac, photos
For Windows users i can recommend Fotosizer, which performs the similar tasks as Pixer.