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Caesium Image Compressor vs XnResize: catalog facts
Caesium Image Compressor	XnResize
Free Free and open source under the GPL.	Free Free to download and use as freeware.
Windows, macOS, Web	Windows, macOS, Linux
Batch processing with visible before and after sizes for the whole folder Resize at the same time as compressing, in one pass	Resizes whole folders in one pass Wide format support including RAW and HEIC
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	Limited to resizing and format conversion Closed source
Downloadable app, Web application	Downloadable app
Open source	Closed source
License: GPL-3.0	License: Freeware
No account needed	No account needed
Works offline	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.