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Caesium Command Line Tools vs Rimage: catalog facts
Caesium Command Line Tools	Rimage
Free Free software under the Apache-2.0 license.	Free Free and open source, dual-licensed under Apache 2.0 and MIT.
Windows, macOS, Linux, Command line	Windows, Command line
Supports lossy and lossless compression Can resize images and target specific file sizes	Modern codecs for small output files Scriptable from the command line
GIF compression is lossy only	No graphical interface No tagged releases on GitHub
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: Apache-2.0 OR MIT
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 October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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