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Document Digital Signing in C#

Wordize for .NET is a professional solution for digital document signing using C#. The Signer class provides C# developers with the ability to sign documents using electronic signatures and X.509 cryptographic certificates. Programmatic addition of digital signatures ensures document authenticity, protection from unauthorized modifications, and compliance with electronic document management requirements.

Key Features:
  • Electronic document signing for DOC, DOCX, DOCM, ODT, OTT, XPS formats
  • Digital document signing - the Signer.Sign() method adds cryptographic signatures using CertificateHolder (container for working with PFX certificates) and X.509 certificates
  • Electronic signature removal - the Signer.RemoveAllSignatures() method removes all digital signatures from documents
  • Electronic signature validation for verifying document integrity
  • PFX certificate support through CertificateHolder.Create() with password protection for PKI infrastructure (cryptographic key and certificate management system)
  • The SignOptions class manages signature comments, signing time, certificate access password, cryptographic provider identifier, and XML signature level
  • Fluent API support for executing document signing operations through SignerContext and method chaining, enhancing C# code readability
Use Cases:
  • Simple electronic signature - basic document signing for internal corporate processes
  • Advanced electronic signature - protection of financial reports and banking documents from falsification
  • Qualified electronic signature - ensuring legal validity of contracts and official documents in electronic document management systems
  • Bulk document signing - automation of document signing in electronic document workflow systems
  • Timestamps - adding time stamps for recording signing time and legal significance
  • Regulatory compliance - ensuring document authentication and compliance with security standards

Test the capabilities of programmatic document signing with digital signatures in the interactive online demo presented on this page. Upload your document and PFX certificate, execute the digital signing operation, and download the signed file for verification. The provided C# code snippet is ready for use in your .NET project.

C#
Run code
Upload document to sign
Upload certificate file (PFX)
Select output format from the list 
using Wordize.DigitalSignatures;

CertificateHolder certificateHolder = CertificateHolder.Create("Certificate.pfx", "password");
Signer.Sign("Input.docx", "Output.docx", certificateHolder);
using Wordize.DigitalSignatures; CertificateHolder certificateHolder = CertificateHolder.Create("Certificate.pfx", "password"); Signer.Sign("Input.docx", "Output.docx", certificateHolder);
Run code

How to Digitally Sign Documents with C#

  1. Connect Wordize SDK to your C# project
  2. Call the Signer.Sign() method, specifying the source document name, output document name, and CertificateHolder with the cryptographic certificate
  3. Get your document signed with digital signature
  4. Sign document with digital signature
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