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Netpbm vs GraphicsMagick: catalog facts
Netpbm	GraphicsMagick
Free Free and freely redistributable.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Over 350 separate tools Converters for about 100 graphics formats	Reads and writes over 92 image formats, including AVIF, HEIC and JXL Multi-threaded processing with OpenMP
No interactive or graphical tools Many small programs to learn instead of one command	Command-line and library only, with no graphical editor Takes some learning for complex operations
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MIT
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 1, 2026

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