BatchResize'em helps you to easily resize multiple images
Version: 1.1Aimed primarily at users unfamiliar with Automator, this application enables you to batch resize images by simply entering the number of pixels required in the new images' width or by indicating the percentage required of the original size.
Operating System: Mac OS X
The resulting images are created preserving the width to height ratio. Supported formats include: PNG, GIF, JPEG, BMP, JPEG 2000, PDF, PICT and TIFF.
Note that the location you choose for the resulting images must be different from that of the originals.