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IrfanView vs nomacs: catalog facts
IrfanView	nomacs
Freemium Free for private, educational and charitable use. A paid licence is required for…	Free Free and open source under the GPL 3.0.
Windows	Windows, macOS, Linux
Opens instantly, even on old hardware Batch conversion and renaming across whole folders	Opens RAW camera files and Photoshop PSD documents Synchronises pan and zoom between two windows or two machines
Windows only and closed source Commercial use needs a paid licence	Not an editor; adjustments are minimal The interface exposes a lot of panels at once
Downloadable app	Downloadable app
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 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.