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PDFtk Server vs Cpdf: catalog facts
PDFtk Server	Cpdf
Freemium Free for non-commercial use. A commercial licence is required otherwise.	Freemium Free for non-commercial use. Commercial use requires a paid 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	Very wide operation set from one binary, including typesetting text onto pages APIs for Java, .NET, C, Python and JavaScript alongside the CLI
Commercial use requires a paid licence Development has been slow, and packaging varies by platform	Free only for non-commercial use Closed source
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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.