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mutool (MuPDF) vs PDFtk Server: catalog facts
mutool (MuPDF)	PDFtk Server
Free Listed as open source, distributed with the MuPDF project.	Freemium Free for non-commercial use. A commercial licence is required otherwise.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Lightweight CLI for batch PDF extraction, cleaning and merging Cross-platform on Linux, macOS and Windows	Terse, stable syntax that is easy to script Fills PDF forms from FDF data, which few command-line tools do
Command-line only, with no graphical interface for casual users Documentation targets developers integrating MuPDF rather than end users	Commercial use requires a paid licence Development has been slow, and packaging varies by platform
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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