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PDFtk Server vs PDF Mix Tool: catalog facts
PDFtk Server	PDF Mix Tool
Freemium Free for non-commercial use. A commercial licence is required otherwise.	Free Free and open source under the GPLv3.
Windows, macOS, Linux, Command line	Linux
Terse, stable syntax that is easy to script Fills PDF forms from FDF data, which few command-line tools do	Merge, split, rotate, N-up and booklet creation in one app Few dependencies (Qt and qpdf)
Commercial use requires a paid licence Development has been slow, and packaging varies by platform	Page-level operations only, no content editing Linux focused
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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 23, 2026

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