PdfHtmlTemplateZoom Property

The zoom, in percent, at which the template HTML is laid out and drawn, from 10 to 200. For a stamp or a template added to a merged document, set it to the zoom of the document, available after a conversion in PrintZoom, so that a font size has the same size in the template and in the page. This property is ignored for header and footer templates, which use the zoom of the document. The default value is 100

public double Zoom { get; set; }