Adding a QR code signature to a PDF file is one of the most efficient ways to verify a document’s authenticity. Each QR code acts as a unique identifier, linking the PDF to a specific signer or verification source. QR code signatures enhance document integrity and make verification convenient for anyone with a smartphone or QR reader. In this article, we’ll walk you through how to sign PDF documents with QR code signatures in .NET applications using the powerful .NET REST API. The process works smoothly in C#, letting you automate signature generation and apply QR-based validation across your PDF workflow.

Steps to Sign PDF With QR Code Signatures Using C# .NET

1. Install GroupDocs.Signature Cloud SDK for .NET from NuGet
2. Use the Configuration class to set up your client credentials
3. Create an object of the SignApi class
4. Configure the QR code signature with SignQRCodeOptions
5. Add the source and output file settings using SignSettings
6. Send a PDF e-sign request and process it with CreateSignatures

The REST API enables users to easily embed QR code signatures into PDFs. Following the outlined steps, you can customize the e-signature appearance and adjust its size. Once the QR code signature is added, the PDF becomes instantly verifiable. It provides a secure way to confirm that the document hasn’t been altered. QR code signing for PDFs ensures quick, contactless verification. Using the Cloud API, developers can automate large-scale PDF signing, boost workflow efficiency, and maintain compliance with digital verification standards without requiring deep technical skills.

Code to Sign PDF With QR Code Signatures Using C# .NET

Signing PDFs with QR code signatures in C# apps via the GroupDocs.Signature Cloud .NET SDK helps businesses, educators, and professionals. It combines simplicity with strong security to create tamper-proof documents that are easy to verify from anywhere. The .NET REST API ensures you can protect your PDFs, speed up approval cycles, and bring transparency to your digital document process.

Explore our guide on Signing PDF with Text Signatures using .NET REST API for more document signing options.