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IrfanView vs FastStone Photo Resizer: catalog facts
IrfanView	FastStone Photo Resizer
Freemium Free for private, educational and charitable use. A paid licence is required for…	Free Free for personal and educational use.
Windows	Windows
Opens instantly, even on old hardware Batch conversion and renaming across whole folders	Batch conversion and renaming in one tool Reads HEIC and WebP
Windows only and closed source Commercial use needs a paid licence	Windows only Free licence covers personal and educational use only
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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.