Sign document with Digital signature - advanced

GroupDocs.Signature provides DigitalSignOptions class to specify different amount of settings for Digital signature

• digital certificate (file on local disk CertificateFilePath or stream CertificateStream) (required)
• password of digital certificate Password (required) 
• digital signature details (Reason, Contact, Location)
• signature image as digital signature appearance on document page (ImageFilePath or ImageStream)
• image signature appearance on document page (Alignment, Margin etc.)

Here are the steps to add Digital signature into document with GroupDocs.Signature:

• Create new instance of Signature class and pass source document path as a constructor parameter.

• Instantiate the DigitalSignOptions object with required certificate and its password.

• Call Sign method of  Signature class instance and pass DigitalSignOptions to it.

• Analyze SignResult result to check newly created signatures if needed.

This example shows how to add Digital signature to document. See SignResult 

using (Signature signature = new Signature("sample.pdf"))
{    
    // initialize digital option with certificate file path
    DigitalSignOptions options = new DigitalSignOptions("certificate.pfx")
    {
        // certifiate password
        Password = "1234567890",
        // digital certificate details
        Reason = "Sign",
        Contact = "JohnSmith",
        Location = "Office1",
        // image as digital certificate appearance on document pages
        ImageFilePath = "sample.jpg",
        //                    
        AllPages = true,
        Width = 80,
        Height = 60,
        VerticalAlignment = VerticalAlignment.Bottom,
        HorizontalAlignment = HorizontalAlignment.Right,
        Margin = new Padding() {  Bottom = 10, Right = 10},
    };
    signature.Sign("signed.pdf", options);
}

More resources

GitHub Examples

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Signature for .NET examples, plugins, and showcase
• GroupDocs.Signature for Java examples, plugins, and showcase
• Document Signature for .NET MVC UI Example 
• Document Signature for .NET App WebForms UI Example
• Document Signature for Java App Dropwizard UI Example
• Document Signature for Java Spring UI Example

Free Online App 

Along with full-featured .NET library we provide simple, but powerful free Apps.
You are welcome to eSign PDF, Word, Excel, PowerPoint documents with free to use online GroupDocs Signature App.