Delete Signatures of the certain type

GroupDocs.Signature provides overloaded Delete method that accepts one SignatureType or list of them. Please be aware that this method modifies the same document that was passed to constructor of the Signature class.

Here are the steps to delete signature by specific type from the document with GroupDocs.Signature:

Create new instance of Signature class and pass source document path or its stream as a constructor parameter;
Call Signature object Delete method and pass certain SignatureType enumeration to it.

This example shows how to delete QR-Code signatures from the document.

using (Signature signature = new Signature("signed.pdf"))
{
    // deleting QR-Code signatures from the document
    DeleteResult result = signature.Delete(SignatureType.QrCode);
    if (result.Succeeded.Count > 0)
    {
        Console.WriteLine("Following QR-Code signatures were deleted:");                    
        int number = 1;
        foreach (QrCodeSignature temp in result.Succeeded)
        {
            Console.WriteLine($"Signature #{number++}: Type: {temp.SignatureType} Id:{temp.SignatureId}, Text: {temp.Text}");
        }
    }
    else
    {
        Helper.WriteError("No one QR-Code signature was deleted.");
    }
}

Advanced Usage Topics

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

More resources

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.

Delete Digital signatures from documents Advanced usage