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Castle Image Viewer vs XnView MP: catalog facts
Castle Image Viewer	XnView MP
Free Free and open source under the GPL.	Freemium Free for private and educational use. A commercial licence is required for business use.
Windows, macOS, Linux, Command line	Windows, macOS, Linux
Reads texture formats like KTX and DDS that many viewers cannot Alpha bleeding for textures with transparency	Reads more than five hundred formats including RAW, HEIC and JPEG XL Batch conversion, renaming and adjustment across whole folders
Editing is limited to a few specialised functions Interface is aimed at game developers rather than photographers	Closed source Commercial use requires a paid licence
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0-or-later	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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