UWP Digital Signature Library

PSPDFKit for Windows is a library for signing PDF documents with an electronic signature or with encrypted certificate-based digital signatures. It offers developers an API to create, validate, and display digitally signed documents, as well as a beautiful UI for hand-drawn electronic signatures.

PSPDFKit SDKs are deployed in some of the world’s most popular applications, such as those made by Autodesk, Disney, DocuSign, Dropbox, IBM, and Lufthansa.

Key Capabilities

  • Create digital signatures – Digitally sign PDFs using a private key

  • Validate digital signatures – Verify the certificate and signature

  • eSignatures – Add drawn, scanned, or typed electronic signatures

  • Signature storage – Store locally or remotely for future reuse

  • Events – Trigger workflows or automations

  • Customizable UI – Hide buttons, match your look & feel, and more

  • Client-side – Sign PDFs directly in the app (no server needed)

  • Extendable – Add annotation, editing, redaction, and more

Guides for Signatures

Introduction to Signatures
Learn about the basics of PDF signatures

Add an Ink Electronic Signature
How to add an electronic signature (eSignature) to a PDF document

Electronic Signature Storage
How to implement a mechanism for storing signatures

Electronically Sign with a Certificate
How to use electronic signatures and digital signatures together

Electronic Signatures UI
How to configure signature creation modes and signature fonts

Supported Digital Signature Methods
Learn about the supported digital signing methods and algorithms

Generate a Certificate
How to generate a self-signed certificate for testing purposes

Add a Digital Signature
How to add a digital signature to a PDF document

Validate Digital Signatures
How to validate digital signatures

Free Trial

Enjoy unlimited trial usage of all our products. Get guidance and tech support from developers who built the product, and get started within minutes.