The open-source way to add digital signatures to your PDFs.

JSignPdf is an open-source application that adds digital signatures to PDF documents, helping individuals and organizations ensure the authenticity, integrity, and non-repudiation of their files. It supports signing with certificates from various keystores, visible and invisible signatures, and timestamping. Usable as both a desktop GUI tool and through its command-line interface. JSignPdf aims to make trusted PDF signing accessible to everyone, regardless of budget or platform.