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Caesium Image Compressor vs JPEGmini: catalog facts
Caesium Image Compressor	JPEGmini
Free Free and open source under the GPL.	Freemium The free version allows 50 images per day after the 7-day Pro trial; Pro is a one-time…
Windows, macOS, Web	Windows, macOS
Batch processing with visible before and after sizes for the whole folder Resize at the same time as compressing, in one pass	Batch processes images Supports JPEG and HEIC image optimization
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	Paid purchase required for continued Pro use The trial limits processing to 50 images per day after seven days
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 8, 2026

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