SwiftPic is a quick and simple batch image converter and resizer, can convert or resize mass amounts of images at once.
Swiftpic is great for resizing images to lower their filesize and free up memory and is also great for creating thumbnail images. SwiftPic supports the following formats: .bmp, .emf, .exif, .gif, .ico, .jpg, .png, .tiff and .wmf.

The license of this software is Freeware, you can free download and free use this image resizer software.