Update Text signatures in document

GroupDocs.Signature provides TextSignature class to manipulate text signatures location, size and textual content.
Please be aware that Update method modifies the same document that was passed to constructor of Signature class.

Here are the steps to update Text signature in the document with GroupDocs.Signature:

Create new instance of Signature class and pass source document path as a constructor parameter;
Instantiate TextSearchOptions object with desired properties;
Call Search method to obtain list of TextSignatures;
Select from list TextSignature object(s) that should be updated;
Call Signature object Update method and pass one or several signatures to it.

This example shows how to update Text signature that was found using Search method.

using (Signature signature = new Signature("sampleSigned.pdf"))
{
    TextSearchOptions options = new TextSearchOptions();
    // search for text signatures in document
    List<TextSignature> signatures = signature.Search<TextSignature>(options);
    if(signatures.Count > 0)
    {
        TextSignature textSignature = signatures[0];
        // change Text property
        textSignature.Text = "John Walkman";
        // change position
        textSignature.Left = textSignature.Left + 10;                    
        textSignature.Top = textSignature.Top + 10;
        // change size. Please note not all documents support changing signature size
        textSignature.Width = 200;
        textSignature.Height = 100;
        bool result = signature.Update(textSignature);
        if(result)
        {
            Console.WriteLine($"Signature with Text '{textSignature.Text}' was updated in the document ['{fileName}'].");
        }
        else
        {
            Console.WriteLine($"Signature was not updated in  the document! Signature with Text '{textSignature.Text}' was not found!");
        }
    }
}

More resources

Advanced Usage Topics

To learn more about document eSign features, please refer to the advanced usage section.

GitHub Examples

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

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.

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