Remove a Signature Field from a PDF in C#

To remove a signature field, use the RemoveSignature method. It requires only the signature index as its parameter. Use the GetSignatureCount method to get the total number of signatures.

If you have only one signature in a PDF document, you can skip the GetSignatureCount method and use the RemoveSignature method with the signature index set to 0 as its parameter.

To delete all signature fields, use the following code:

using GdPicturePDF gdPicturePDF = new GdPicturePDF();
gdPicturePDF.LoadFromFile(@"C:\temp\source.pdf");
// Get the total amount of signatures.
int signatureCount = gdPicturePDF.GetSignatureCount();
for (int i = 0; i <= signatureCount - 1; i++)
{
    // Remove the signature.
    gdPicturePDF.RemoveSignature(0);
}
gdPicturePDF.SaveToFile(@"C:\temp\output.pdf");

Using gdPicturePDF As GdPicturePDF = New GdPicturePDF()
    gdPicturePDF.LoadFromFile("C:\temp\source.pdf")
    ' Get the total amount of signatures.
    Dim signatureCount As Integer = gdPicturePDF.GetSignatureCount()
    For i = 0 To signatureCount - 1
        ' Remove the signature.
        gdPicturePDF.RemoveSignature(0)
    Next
    gdPicturePDF.SaveToFile("C:\temp\output.pdf")
End Using

Used Methods

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