.NET API for eSignature Manipulation

Digitally Sign Files & Manage eSignature of Text, Image, QR-Code, Barcode, Stamp, & Metadata types in .NET Applications.

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.NET e-Signature API

GroupDocs.Signature for .NET


Use GroupDocs.Signature for .NET API to build applications in C#, ASP.NET, and other .NET-based technologies, that allow you to sign digital business documents, spreadsheets, presentations, images and PDF files. You can add signatures of many types, such as, text, image, barcode, QR-code etc to digitally secure your electronic files. Our digital signature API, allows you to fetch all registered certificates from system. GroupDocs.Signature for .NET empowers you with simple and advanced search options to locate your required signatures in a flash. The option to customize signature properties, such as, dimensions, shadow, alignment and more is also available through GroupDocs.Signature for .NET API.

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GroupDocs.Signature for .NET Features



Set Height, Width & Margins for Text or Image Signature & Place on Specific Page


Align Text or Image Signature Horizontally or Vertically


Apply Text or Image Signature on Specific Excel Sheet or Set eSignature across all Sheets


Specify Particular Row & Column Number to Place Text or Image Signature in Excel Sheet


Apply Shadow to Text Signature in Microsoft PowerPoint & Setup its Color, Angle & Transparency


Configure Text Signature Border Styles & Font Options for Excel Sheets


Set Image Signature Type, e.g. Round or Square & Configure Margins, Font Color, Rotation


Apply Digital Certificates to Documents, Spreadsheets & PDF File with Signature Line


Perform Color Settings, Apply Transparency & Rotation to Text Signature


Setup Brightness & Grayscale Options & Specify Indentation of Image Signature in an Image


Specify Measurement Type of Signature, e.g., Percentage, Millimeters etc.


Make eSignature Visible or Hidden in PDF Documents


Sign PDF Documents with Text Signature as Image, Annotation, Sticker or Watermark


Put Text Signature into Form Fields of MS Word & PDF Documents


Specify Arbitrary Pages of Documents for Processing Signature or eSignature Verification


Save Signed Image File in Different Format & Export Signed Spreadsheet as Image or Multi-Page TIFF


Assign, Modify & Remove Password to Signed Files & Apply eSignature to Password Protected Files


Extract Document Information, e.g., Page Count, through File URL


Setup Signature Brush Styles as Solid, Texture, Linear Gradient & Radial Gradient


Add Custom Data Object, VCard or Email Object to QR-Code & Verify Encrypted QR-Code in PDF Files


Sign Documents with Custom Encrypted QR-Code Text or Data

Easily Add Digital Signatures

GroupDocs.Signature for .NET API allows you to add various types of signatures to supported file formats. Following code example shows how to apply text signature to a PDF document:

Apply Text Signature to a PDF Document using C#

 // setup Signature configuration
SignatureConfig config = new SignatureConfig();
config.StoragePath = @"D:\storage\"; 
 // Initailize the signature handler
SignatureHandler handler = new SignatureHandler(config);
// setup text signature options
PdfSignTextOptions signOptions = new PdfSignTextOptions("John Smith"); 
signOptions.Left = 100; 
 // Sign document 
string signedPath = handler.Sign<string>("test.pdf", signOptions, new SaveOptions { OutputType = OutputType.String, OutputFileName = "Pdf_Documents_Simple" });

Supported Barcode Signature Types

Our signature manipulation API offers you feature to apply barcode signatures to supported document formats. GroupDocs.Signature for .NET supports various barcode types, such as, Code128, Code39Extended, Code39Standard, EAN14, EAN8, ITF14, UPCA, and UPCE. A static object named “AllTypes” is also provided to support all registered barcode types.

Search Signatures & Certificates

GroupDocs.Signature for .NET API, allows you to search for Digital certificates from Word documents, Excel spreadsheets, and PDF files. You can also fetch all digital certificates registered in system. Metadata signatures can also be searched in Word documents, Excel spreadsheets, and PDF files, using GroupDocs.Signature for .NET API.

Through GroupDocs.Signature for .NET API, you can search QR-Code and Barcode signatures in any document, presentation, spreadsheet, image, as well as PDF file, and fetch the search progress. You can also search custom data object from documents signed with QR-Code Signature.

Advanced Search Options for Barcode

You can search and locate your required barcode through GroupDocs.Signature for.NET API very easily, as our signature API offers advanced search options. These enable you to search barcode on a particular page, search throughout a document, specify different pages to search (first, last, even, odd), search for barcode of particular encoding type, search barcode based on specific text string, or search barcode based on string with “contains” option.

Support and Learning Resources


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