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Caesium Image Compressor vs XnConvert: catalog facts
Caesium Image Compressor	XnConvert
Free Free and open source under the GPL.	Free Free to download and use, per the developer.
Windows, macOS, Web	Windows, macOS, Linux, Android
Batch processing with visible before and after sizes for the whole folder Resize at the same time as compressing, in one pass	More than 80 chainable batch actions Broad format support including RAW, HEIC, AVIF and JPEG-XL
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	Closed source Focused on batch work rather than editing single images by hand
Downloadable app, Web application	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
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 September 23, 2026

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