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Caesium Command Line Tools vs imgp: catalog facts
Caesium Command Line Tools	imgp
Free Free software under the Apache-2.0 license.	Free Free and open source under GPL-3.0-or-later.
Windows, macOS, Linux, Command line	Command line
Supports lossy and lossless compression Can resize images and target specific file sizes	Resizes and rotates batches of images Can process directories recursively
GIF compression is lossy only	Command-line interface only
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-or-later
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 October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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