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nomacs vs XnView Classic: catalog facts
nomacs	XnView Classic
Free Free and open source under the GPL 3.0.	Free Offered as free software by the developer.
Windows, macOS, Linux	Windows
Opens RAW camera files and Photoshop PSD documents Synchronises pan and zoom between two windows or two machines	Opens a very large number of image formats, including RAW and DICOM Lossless JPEG rotation and crop
Not an editor; adjustments are minimal The interface exposes a lot of panels at once	Classic edition is the older product; XnView MP is the cross-platform successor line Closed source
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 October 2, 2026

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