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PDF Mix Tool vs PDFtk Server: catalog facts
PDF Mix Tool	PDFtk Server
Free Free and open source under the GPLv3.	Freemium Free for non-commercial use. A commercial licence is required otherwise.
Linux	Windows, macOS, Linux, Command line
Merge, split, rotate, N-up and booklet creation in one app Few dependencies (Qt and qpdf)	Terse, stable syntax that is easy to script Fills PDF forms from FDF data, which few command-line tools do
Page-level operations only, no content editing Linux focused	Commercial use requires a paid licence Development has been slow, and packaging varies by platform
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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