Fotosizer is a free batch image resizer tool for windows. It allows you batch resize images using either percentage of width and height or by specifying a custom width and height.
Fotosizer is a multilingual app available in English, French, Gernam, Spanish and Italian. Not only resizing it also supports some simple editing like batch rotation, basic photo effects etc. It supports JPEG, PNG, BMP, TGA and GIF images. Works with Windows 98/Me/2000/XP/Vista.