.NET eSignature APIs

Automate document signing process - Electronically sign Microsoft Word, Excel, PowerPoint and PDF documents in .NET applications

  Download Free Trial
GroupDocs.Signature  for .NET

GroupDocs.Signature for .NET


GroupDocs.Signature for .NET allows developers to write applications with ability to significantly sign electronic docs of various file formats. This e-signing API permits the users to add different types of signatures like text, image or digital signatures on electronic documents. The quite captivating fact about the API is, its UI less and independent calls can be made.

Using GroupDocs.Signature for .NET API users can easily sign their personal or business e-documents. API permits users to add text, image or digital signatures as per their needs. Each signature comes with its own manageable properties. Basically, this lightweight E-Signing API is a single solution for multiple platforms. API is totally UI-Less that makes its integration and configuration quite simple.

Advanced Document Signature API Features



Easy integration


Upload, type or draw signatures


REST API solution so integrated on desktop, mobile and web


Multiple supported document formats


Multiple template elements formatting support


Multiple signature types


Multiple signature properties

Multiple Signature Types

  • Text
  • Image
  • Digital signatures with different certificate type such as Public-Key Cryptography Standards, X.509 Certificate, p7b

Common Text, Image and Digital Signature Properties

  • Document page number
  • Height
  • Left
  • Sign all pages
  • Top
  • Width
  • TEXT only for Text and Image properties

Specific Digital Signature Properties

  • Digital certificate
  • Document page number
  • Horizontal alignment
  • Image file name
  • Image stream
  • Password
  • Rectangle
  • Signature
  • Vertical alignment
  • Visible

E-Signature API supported formats

  • OOXML Macro Enabled Document : DOCM
  • OOXML Document Template : DOTX
  • OOXML Macro Enabled Document Template : DOTM
  • Word Document 97-2003 : DOC
  • Word Template 97-2003 : DOT
  • OOXML 2007-2010 : XLSX
  • OOXML Macro Enabled Workbook : XLSM
  • OOXML Binary Workbook : XLSB
  • Excel Workbook 97-2003 : XLS
  • OOXML Presentation : PPTX
  • OOXML SlideShow : PPSX
  • PowerPoint Presentation 97-2003 : PPT
  • PowerPoint SlideShow 97-2003 : PPS
  • Portable Document Format : PDF

Installation and Usage

.NET signature API files can be installed/downloaded directly as:

Once the API package is installed using any of the these sources – just add reference of GroupDocs.Signature.dll and you are ready to add signatures on e-documents.

Support and Learning Resources


GroupDocs.Signature offers individual electronically document signing APIs for other popular development environments as listed below: