How to Sign PDF with Text Signature using C#. For more information, please follow link: https://kb.groupdocs.com/signature/net/how-to-sign-pdf-with-text-signature-using-csharp/

How to Sign PDF with Text Signature using C#.cs

using GroupDocs.Signature;
using GroupDocs.Signature.Domain;
using GroupDocs.Signature.Options;

namespace SignPDFwithTextSignatureUsingCSharp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Set License to avoid the limitations of Signature library
            License lic = new License();
            lic.SetLicense(@"GroupDocs.Signature.lic");

            // load the source PDF file
            using (Signature signature = new Signature("input.pdf"))
            {
                // Set some options for text signature
                TextSignOptions options = new TextSignOptions("John Smith")
                {
                    // set signature position
                    Left = 100,
                    Top = 100,
                    // set signature rectangle
                    Width = 100,
                    Height = 30,
                    Font = new SignatureFont { Size = 12, FamilyName = "Comic Sans MS" },
                    Text = "Sign PDF using Text Signature",
                    DocumentType = DocumentType.WordProcessing,
                    Border = new Border { Visible = true }
                };

                // Save and sign the output PDF
                signature.Sign("output.pdf", options);
            }

        }
    }
}