ImageOptim is an image compressor for macOS. It makes PNG, JPEG, GIF and SVG files smaller so they take less disk space and load faster on the web.
Drag images into the window or onto the Dock icon and it runs several optimizers on each file, then keeps the smallest result. Under the hood it uses tools such as MozJPEG, pngquant, OxiPNG, Zopfli, PNGOUT, Gifsicle and SVGO. It also removes EXIF data like GPS position and camera serial numbers, embedded thumbnails and unneeded color profiles. You can also run it from the Finder Services menu, the command line or Sketch.
By default the compression is lossless, so images look exactly the same. Turn on Lossy minification in Preferences to trade a little quality for much smaller files, for JPEG, PNG, SVG and animated GIF. It suits web developers, designers and app developers who want lighter assets without a web upload.
ImageOptim is free and open source under the GPL v2 or later, made by Kornel Lesiński. It runs locally, needs macOS 11 or later and has full Apple Silicon support. The last release, 1.9.3, came out in October 2023.
Frequently asked questions
Is ImageOptim free?
Yes. ImageOptim is free to download from imageoptim.com, with no paid tier. The developer accepts donations.
Is ImageOptim safe and open source?
Yes. The source code is on GitHub under the GPL v2 or later. Images are processed on your Mac and are not uploaded. ImageOptim is not sold on the Mac App Store, and the developer warns about knock-off apps there.
How do I install ImageOptim?
Download it from imageoptim.com and move it to your Applications folder. With Homebrew, run brew install --cask imageoptim.
What macOS version does ImageOptim need?
Version 1.9.3 needs macOS 11 Big Sur or later and runs natively on Apple Silicon. The site also offers an older build for OS X 10.10 Yosemite. Note that 1.9.3 from October 2023 is still the latest release, although the GitHub repository keeps getting fixes.
How does ImageOptim compare to Squash or Optimage?
Squash and Optimage are paid image compressors. ImageOptim is free and combines open source optimizers in one drag-and-drop window. It is lossless by default, so for the smallest files you need to enable Lossy minification yourself.
Can ImageOptim keep camera and copyright metadata?
Yes. Uncheck Strip JPEG metadata in Preferences. If PNG files take too long, uncheck PNGOUT and Zopfli in Preferences for faster but slightly less effective compression.
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