Compare software

oxipng vs ImageOptim: catalog facts
oxipng	ImageOptim
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under the GPL.
Windows, macOS, Linux, Command line	macOS
Uses parallel processing and supports animated PNG files.	Runs several optimisers and keeps whichever result is smallest Removes GPS and EXIF data as part of optimising
It targets PNG formats rather than general image conversion.	macOS only Optimisation is in place, so originals should be kept separately
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.