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