Seamlessly combines all the best image optimization tools: MozJPEG , pngquant , Pngcrush , 7zip , SVGO and Google Zopfli . All Free and Open-Source .

Reduces image file sizes — so they take up less disk space and down­load faster — by applying advanced compression that preserves quality.

“Basically, ImageOptim works like magic, cutting down the size of images without making them look worse” — MacStories

“The app works efficiently, it’s brain-dead simple to use, and it does just what it promises” — MacWorld

ImageOptim is excellent for publishing images on the web (easily shrinks images “Saved for Web” in Photoshop). It's useful for making Mac and iPhone/iPad applications smaller (if you configure Xcode to allow better optimization).

ImageOptim removes EXIF meta­data, such as GPS position and camera's serial number, so that you can publish images without exposing private information (but there's an option to keep the meta­data if you need it).

How does it work? When you drag'n'drop images into ImageOptim's window it will run several image optimization tools automatically and combine their results, ensuring that you always get the smallest file. See installation and usage instructions. ImageOptim integrates well with macOS , so you can also drop files on ImageOptim's Dock icon, or use Services menu in Finder, or Markup menu on attached images in Apple Mail. ImageOptim can also be launched from command line or Sketch. A special option for even smaller files If you enable Lossy minification you'll get smallest file sizes possible. By default ImageOptim is very cautious and exactly preserves image quality, but if you allow it to change the quality — even only a little — it will be free to use much more aggressive optimizations that give the biggest results. You can configure lossy optimizations in ImageOptim's Preferences . ImageOptim can apply lossy compression not only to JPEG , but SVG , anim GIF and PNG as well!