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