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oxipng vs Caesium Image Compressor: catalog facts
oxipng	Caesium Image Compressor
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	Windows, macOS, Web
Uses parallel processing and supports animated PNG files.	Batch processing with visible before and after sizes for the whole folder Resize at the same time as compressing, in one pass
It targets PNG formats rather than general image conversion.	No official Linux binary; you compile it or use a third-party build Windows 10 build 1809 or later and macOS 12 or later, 64-bit only
Downloadable app	Downloadable app, Web application
Open source	Open source
License: MIT	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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