at32 BJBRserv is a free web utility to be used by programmers which lets you, via code, resize images or photos in batches. This makes it an ideal tool to apply to web galleries that have many images.
at32 BJBRserv runs from the Windows command line (or in MSDOS) and works with the most popular web programming languages (ASP, Perl, PHP, etc).
Among the at32 BJBRserv commands it not only lets you resize images but also apply small transparency or optimization effects.