Signing PDF with Form Field

Introduction

Digital signatures provide a secure and legally binding way to sign documents electronically, ensuring their authenticity and integrity. In this tutorial, we’ll learn how to sign a PDF document that contains form fields using the GroupDocs.Signature for .NET library.

Prerequisites

Before we begin, ensure you have the following prerequisites:

  1. GroupDocs.Signature for .NET Library: Download and install the library from here.
  2. Development Environment: Set up a .NET development environment.
  3. PDF Document: Have a PDF document with form fields ready for signing.

Import Namespaces

Make sure to import the necessary namespaces into your project:

using System;
using System.IO;
using GroupDocs.Signature;
using GroupDocs.Signature.Domain;
using GroupDocs.Signature.Options;

Step 1: Load the PDF Document

First, specify the path to your PDF document:

string filePath = "sample.pdf";

Step 2: Define Output Path

Define the path where the signed document will be saved:

string outputFilePath = Path.Combine("Your Document Directory", "SignPdfWithFormField", "SignedWithFormField.pdf");

Step 3: Initialize Signature Object

Create an instance of the Signature class and pass the PDF file path to it:

using (Signature signature = new Signature(filePath))
{
    // Signature code will go here
}

Step 4: Instantiate Form Field Signature

Next, instantiate a text form field signature with the desired field name and value:

FormFieldSignature textSignature = new TextFormFieldSignature("FieldText", "Value1");

Step 5: Configure Signature Options

Create options for signing based on the text form field signature. You can specify the position and size of the signature:

FormFieldSignOptions options = new FormFieldSignOptions(textSignature)
{
    Top = 150,
    Left = 50,
    Height = 50,
    Width = 200
};

Step 6: Sign the Document

Sign the document using the specified options and save the signed document to the output path:

SignResult result = signature.Sign(outputFilePath, options);

Conclusion

In this tutorial, we’ve learned how to sign a PDF document containing form fields using GroupDocs.Signature for .NET. Digital signatures are essential for ensuring document authenticity and integrity in various industries.

FAQ’s

Can I sign PDF documents programmatically using GroupDocs.Signature for .NET?

Yes, you can sign PDF documents programmatically using GroupDocs.Signature for .NET as demonstrated in this tutorial.

Is GroupDocs.Signature for .NET suitable for enterprise-level applications?

Absolutely! GroupDocs.Signature for .NET is robust and scalable, making it suitable for enterprise-level applications.

Does GroupDocs.Signature for .NET support other document formats besides PDF?

Yes, GroupDocs.Signature for .NET supports a wide range of document formats, including Word, Excel, PowerPoint, and more.

Can I customize the appearance of the signature?

Yes, you can customize the appearance of the signature by adjusting various parameters such as color, font, size, and position.

Is there a trial version available for GroupDocs.Signature for .NET?

Yes, you can download a free trial version of GroupDocs.Signature for .NET from here.

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