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when flattening a pdf document, not all of the editable fields are beeing removed. This just happens, if a signature is on a page. And then only the page with the signature has that behavior. An example pdf document and its flattend form is attached.

Here is the code, I use:

private void FlattenAnpassbogen(EditablePdfDocumentInstance pdfDocument)


if (pdfDocument == null)

throw new ArgumentNullException(nameof(pdfDocument));

using(PdfLoadedDocument doc = new PdfLoadedDocument(pdfDocument.Data))

using (MemoryStream targetStream = new MemoryStream())


if(doc.Form != null)

doc.Form.Flatten = true;



pdfDocument.Data = targetStream.ToArray();