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nomacs vs XnView MP: catalog facts
nomacs	XnView MP
Free Free and open source under the GPL 3.0.	Freemium Free for private and educational use. A commercial licence is required for business use.
Windows, macOS, Linux	Windows, macOS, Linux
Opens RAW camera files and Photoshop PSD documents Synchronises pan and zoom between two windows or two machines	Reads more than five hundred formats including RAW, HEIC and JPEG XL Batch conversion, renaming and adjustment across whole folders
Not an editor; adjustments are minimal The interface exposes a lot of panels at once	Closed source Commercial use requires a paid licence
Downloadable app	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 21, 2026

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