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Caesium Image Compressor vs Squash: catalog facts
Caesium Image Compressor	Squash
Free Free and open source under the GPL.	Paid Paid app, with additional effect packs sold separately.
Windows, macOS, Web	macOS
Batch processing with visible before and after sizes for the whole folder Resize at the same time as compressing, in one pass	Batch resize, convert and compress in one step Removes or edits private metadata
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	macOS only Extra effect packs cost more
Downloadable app, Web application	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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