ImageOptim - Free and Open-Source Utility to Reduce File Sizes

ImageOptim is a tiny utility that every Mac user should have in their toolkit. It integrates a half dozen image optimization tools behind the scenes to quickly and efficiently provide an optimum file size without quality loss, including MozJPEG, pngquant, Pngcrush, 7zip, SVGO and Google Zopfli. As part of the file reduction process, it removes EXIF data that could compromise your privacy like GPS location and camera model.

There are a variety of ways to access ImageOptim. You can drag and drop a file or group of files on the open program interface or the icon in the dock. You can also use the Services menu and assign a keyboard shortcut. There is even a CLI.

If you enable lossy minification, you can reduce file sizes to smaller than what you get with the default settings. The program operates really quickly on my M3 iMac, but if you have speed issues with PNG files, you can turn off PNGOUT and Zopfli to get a quicker operation with a small increase in file size.

ImageOptim was developed by Kornel Lesiński. It is offered free of charge in every country in the world. You can download it at the developer's website.