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XnConvert vs Caesium Image Compressor: catalog facts
XnConvert	Caesium Image Compressor
Free Free to download and use, per the developer.	Free Free and open source under the GPL.
Windows, macOS, Linux, Android	Windows, macOS, Web
More than 80 chainable batch actions Broad format support including RAW, HEIC, AVIF and JPEG-XL	Batch processing with visible before and after sizes for the whole folder Resize at the same time as compressing, in one pass
Closed source Focused on batch work rather than editing single images by hand	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
Downloadable app	Downloadable app, Web application
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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