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NConvert vs GraphicsMagick: catalog facts
NConvert	GraphicsMagick
Freemium Freeware for private use; commercial use requires a business licence from 100 euros plus…	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Reads more than 500 image formats and writes about 70 More than 80 commands for transforms, adjustments, filters and metadata	Reads and writes over 92 image formats, including AVIF, HEIC and JXL Multi-threaded processing with OpenMP
Commercial use requires a paid licence No graphical interface; XnConvert is the GUI equivalent	Command-line and library only, with no graphical editor Takes some learning for complex operations
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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