ImageOptim optimizes images — so they take up less disk space and load faster — by finding best compression parameters and by removing unnecessary comments and color profiles. It handles PNG, JPEG and GIF animations.
ImageOptim seamlessly integrates best optimisation tools: PNGOUT, Zopfli, Pngcrush, AdvPNG, extended OptiPNG, JpegOptim, jpegrescan, jpegtran, and Gifsicle.
It's excellent for publishing images on the web (easily shrinks images “Saved for Web” in Photoshop) and also useful for making Mac and iPhone/iPad applications smaller (if you configure Xcode).
How to use it
Simply drag'n'drop images or folders into the window! They'll be optimized in-place.
You can also drop files on ImageOptim's Dock icon, or use Services menu in Finder, or launch it from a shell script.
ImageOptim is free, open-source software under terms of the GPL v2 or later. Your contributions are welcome! Please checkout/fork the source code on GitHub and improve it! Feel free to contact me for assistance.