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GraphicsMagick vs XL Converter: catalog facts
GraphicsMagick	XL Converter
Free Free and open source.	Free Free and open source under the GPLv3.
Windows, macOS, Linux, Command line	Windows, Linux
Reads and writes over 92 image formats, including AVIF, HEIC and JXL Multi-threaded processing with OpenMP	Supports JPEG XL, AVIF and JPEGLI encoding Lossless, reversible JPEG to JPEG XL transcoding
Command-line and library only, with no graphical editor Takes some learning for complex operations	macOS build is a deprecated beta Focused on conversion rather than editing
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-only
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.