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PDFtk Server vs pdfjam: catalog facts
PDFtk Server	pdfjam
Freemium Free for non-commercial use. A commercial licence is required otherwise.	Free Free and open source under the GPL 2 license.
Windows, macOS, Linux, Command line	Command line
Terse, stable syntax that is easy to script Fills PDF forms from FDF data, which few command-line tools do	N-up layouts, booklets and signatures for binding Accepts PDF, PostScript and image inputs
Commercial use requires a paid licence Development has been slow, and packaging varies by platform	Requires a LaTeX installation Command line only, no graphical interface
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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