Top Alternatives to ImageOptim

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

ImageMagick is a free and open-source software suite for displaying, converting, and editing raster image and vector image files.

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

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 or on the server as a console program.

PNGGauntlet is a PNG compression app for Windows.

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

JPEGmini is a photo optimization software.

OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information.

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

Caesium is an image compression tool.

optimus.io is a service for smart compression of images.

GraphicsMagick is a utility of image processing.