1. GroupDocs Documentation
    2. /
    3. GroupDocs.Signature Product Family
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    5. GroupDocs.Signature for .NET
    6. /
    7. Developer Guide
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    9. Advanced usage
    10. /
    11. Signing documents
    12. /
    13. ✎ Extensions

    Sign document with extensions

    GroupDocs.Signature provides with SignOptions property Extensions that expects list of different extensions classes. At this moment here are few of them

    • SpreadsheetPosition that allows to specify for Spreadsheet documents signature position as Row and Column numbers
    • TextShadow alternative extension for Text signature property

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

    • Create new instance of Signature class and pass source document path as a constructor parameter.
    • Instantiate the SignOptions object with all required additional options.
    • Create instance of required Extension and call SignOptions.Extensions.Add method with passed object
    • Call Sign method of  Signature class instance and pass SignOptions to it.

    Sign document with Text signature

    This example shows how to add Text signature to document.

    using (Signature signature = new Signature("sample.pdf"))
{
    TextSignOptions options = new TextSignOptions("John Smith")
    {
        // set signature position
        Left = 100,
        Top = 100,
        // set signature rectangle
        Width = 100,
        Height = 30,
        // set signature alignment
        // when VerticalAlignment is set the Top coordinate will be ignored.
        // Use Margin properties Top, Bottom to provide vertical offset
        VerticalAlignment = Domain.VerticalAlignment.Top,
        // when HorizontalAlignment is set the Left coordinate will be ignored.
        // Use Margin properties Left, Right to provide horizontal offset
        HorizontalAlignment = Domain.HorizontalAlignment.Right,
        Margin = new Padding() { Top = 20, Right = 20 },
        // adjust signature appearance
        // setup signature border
        Border = new Border()
        {
            Color = Color.DarkGreen,
            DashStyle = DashStyle.DashLongDashDot,
            Transparency = 0.5,
            Visible = true,
            Weight = 2
        },
        // set text color and Font
        ForeColor = Color.Red,
        Font = new SignatureFont { Size = 12, FamilyName = "Comic Sans MS" },
        // setup background
        Background = new Background()
        {
            Color = Color.LimeGreen,
            Transparency = 0.5,
            Brush = new LinearGradientBrush(Color.LimeGreen, Color.DarkGreen)
        },
        // set rotation
        RotationAngle = 45,
        // set alternative signature implementation on document page
        SignatureImplementation = TextSignatureImplementation.Image

    };
    // set up shadow options for text
    TextShadow shadow = new TextShadow();
    shadow.Color = Color.OrangeRed;
    shadow.Angle = 135;
    shadow.Blur = 5;
    shadow.Distance = 4;
    shadow.Transparency = 0.2;
    //add text shadow to signature extensions
    options.Extensions.Add(shadow);

    // specify Spreadsheet position over extension
     options.Extensions.Add(new SpreadsheetPosition(10, 10));
    // sign document to file
    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:

    Free Online Apps

    Along with the full-featured .NET library, we provide simple but powerful free online apps.

    To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.

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