ImageOptim is a free app that makes images take up less disk space and load faster, without sacrificing quality. It optimizes compression parameters, removes junk metadata and unnecessary color profiles.
ImageOptim seamlessly integrates the best optimization 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.
More about PNG
My article “PNG that works” explains why ImageOptim removes gamma information and how to get even smaller PNG files with transparency that works in ancient versions of IE.
Open Source
ImageOptim is free, open-source software under terms of the GPL v2 or later. You can find the source code on GitHub and improve it! Feel free to contact me for assistance.
ImageOptim is sponsored by MaxCDN.
PNGOUT is bundled with permission of Ardfry Imaging, LLC and is not covered by the GPL.
Frequent answers
- Will ImageOptim be in the App Store?
Unfortunately not, and currently there's an illegal (and buggy) copy in the App Store. Apple knows about this since April 2014 (they've acknowledged my report and didn't remove the app).
If you paid AppStore for it, demand a refund.
ImageOptim is given for free on terms that basically say “you can do whatever you want except taking this freedom away from others”. Apple does not allow such permissive terms. Apple requires all App Store users to accept DRM (copy protection) and legal restrictions in the iTunes EULA.
You can get ImageOptim here, DRM-free. You can share it, modify it, use it in any country in the world, even sell it, as long as you don't forbid anybody else from doing the same.
You can donate to support the project.
- How does ImageOptim compare to TinyPNG and JPEGMini?
Tools like ImageAlpha/pngquant/TinyPNG and JPEGMini can make files much smaller by using lossy compression which (slightly) lowers image quality. ImageOptim is lossless — it compresses image files without affecting quality.
For best results you should first compress images using a lossy tool and then apply ImageOptim for even better compression.
