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PDFtk Server vs PDF Arranger: catalog facts
PDFtk Server	PDF Arranger
Freemium Free for non-commercial use. A commercial licence is required otherwise.	Free Free and open source under the GPL 3.0.
Windows, macOS, Linux, Command line	Windows, Linux
Terse, stable syntax that is easy to script Fills PDF forms from FDF data, which few command-line tools do	Page thumbnails you drag, rotate, crop and delete directly Merges and interleaves two documents, ideal for one-sided scans
Commercial use requires a paid licence Development has been slow, and packaging varies by platform	Page operations only; no text or image editing No official macOS build
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 21, 2026

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