pyHanko

Command-line and library tool for digitally signing, stamping, and validating PDF documents.

Desktopfreeglobal

A command-line tool and Python library for digitally signing, stamping, validating, and encrypting PDF files, with support for PAdES profiles, RFC 3161 timestamps, PKCS#11 hardware tokens (including smartcards), and text/QR stamps. It helps teams automate compliant e-signature and long-term-validation workflows from scripts or CI, and is aimed at developers, IT administrators, and organizations rather than non-technical GUI users.

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