ImageOptim 1.9.3 for Mac

ImageOptim is a front-end (GUI) for lossless image optimization tools: PNGOUT, AdvPNG, Pngcrush, OptiPNG, JpegOptim, MozJPEG, jpegtran, and Gifsicle. Images are made smaller (in terms of disk size) without losing quality, by recompressing them using the best combination of compression settings, better algorithms, and by removing optional, invisible information like comments.

ImageOptim for Mac can be used for publishing images on the web (easily shrinks images “Saved for Web” in Photoshop). It’s also useful for making Mac and iPhone/iPad applications smaller (if you configure Xcode to allow better optimization). Moreover, it 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).

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. The program can also be launched from command line or sketch. By default, it 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, animated GIF and PNG as well!

You can get the same or better compression if you enable the Lossy minification option in the program preferences. Tools like ImageAlpha/pngquant/TinyPNG/JPEGMini/MozJPEG make files smaller by using lossy compression which lowers image quality, which ImageOptim doesn’t do by default, but can if you allow it.

The ImageOptim app only works on Macs, if you seek for a compression tool for Windows you can try: FileOptimizer. Alternatively, you can use the online version of ImageOptim which can be accessed from your browser on any platform.