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Digital signatures

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Add Long Term Validation (LTV) data to an existing signature

Digitally sign a PDF form in C# or VB.NET

This code sample shows you how you can import a digital signature and use it to sign a PDF document in C# or VB.NET.

Create a new digitally signed PDF document

This code sample creates a new PDF document, adds a signature fields, and then digitally signs it. Read or search our code sample base.

How to sign and verify updates to a PDF document

This code sample shows how you can sign PDF documents and how to handle updates to form data. Read or search our code sample base.

Create a custom signature handler to sign and verify PDF documents

This code sample shows how to create your own signature handler. Read this code sample or search our code sample base.