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PDFtk Server vs pdfcpu: catalog facts
PDFtk Server	pdfcpu
Freemium Free for non-commercial use. A commercial licence is required otherwise.	Free Free and open source under the Apache licence.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Terse, stable syntax that is easy to script Fills PDF forms from FDF data, which few command-line tools do	Single static binary with no dependencies Doubles as a Go library, so the same operations work inside your own program
Commercial use requires a paid licence Development has been slow, and packaging varies by platform	Command line only Newer than the established tools, so some edge-case PDFs still fail
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
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.