PdfDocumentOptionsPdfPageSize Property

This property controls the page size of the PDF document generated by the HTML to PDF converter. When AutoResizePdfPageWidth is true (the default value is false), the converter automatically resizes the PDF page width to match the HtmlViewerWidth value at the default 96 DPI resolution. When AutoResizePdfPageHeight is true (the default value is false), the converter automatically resizes the PDF page height to match the HTML content height at the default 96 DPI resolution. The page has this exact size when both properties are false. The default size of the PDF document page is A4

public PdfPageSize PdfPageSize { get; set; }