FastStone Photo Resizer is an image converter and renaming tool that intends to enable users to convert, rename, resize, crop, rotate, change color depth, etc…

ImageOptim makes images load faster. Removes bloated metadata. Saves disk space & bandwidth by compressing images without losing quality.

Phatch (PHoto & bATCH) is a raster graphics editor used to batch process digital graphics and photographs. Phatch can be used on the desktop as a GUI program …

PngOptimizer cleans PNG files of useless or wrong information, reduces your PNG files weight.

Light Image Resizer can resize and convert images one by one or in batch as well as other features.

FileOptimizer is an advanced file optimizer featuring a lossless (no quality loss) file size reduction.

ImBatch is a batch image processing software.

PhotoBulk is an easy-to-use batch photo editor. Watermark photos, Optimize and Rename photos at once.

Radical Image Optimization Tool (RIOT) is a free image optimizer that will let you to visually adjust compression parameters.