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GraphicsMagick vs Resizer: catalog facts
GraphicsMagick	Resizer
Free Free and open source.	Freemium Lite edition is free; a Pro licence is sold on the den4b site.
Windows, macOS, Linux, Command line	Windows
Reads and writes over 92 image formats, including AVIF, HEIC and JXL Multi-threaded processing with OpenMP	Simple drag-and-drop batch workflow Fit, fill and crop, or stretch resize modes
Command-line and library only, with no graphical editor Takes some learning for complex operations	Windows only Limited to BMP, GIF, PNG, JPEG and TIFF
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License: CC-BY-NC-ND-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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