IronPDF - Add Digital Signatures in C#

Key Features

• It`s a form of digital signature, ensuring that the end user receives an unedited PDF document so that you can ensure that your content is being delivered verbatim without being edited by third parties along the way.
• An x509certificate2 certificate is an encryption certificate used to digitally sign PDF documents.
• This allows us to encrypt them, ensuring that they have not been edited or altered in any way.

Technical Specifications

• **Publisher:** https://ironpdf.com/docs/questions/add-digital-signature-pdf-programmatically/
• **License:** Shareware
• **Operating System:** Windows 7, Windows 8, Windows 10, Windows 11
• **Last Updated:** October 15, 2025
• **Category:** Programming / Misc Programming Tools