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NConvert vs Netpbm: catalog facts
NConvert	Netpbm
Freemium Freeware for private use; commercial use requires a business licence from 100 euros plus…	Free Free and freely redistributable.
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	Over 350 separate tools Converters for about 100 graphics formats
Commercial use requires a paid licence No graphical interface; XnConvert is the GUI equivalent	No interactive or graphical tools Many small programs to learn instead of one command
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: GPL-3.0-or-later
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.