from ironpdf import *
 
html = "<p>Lorem ipsum dolor sit amet..."

renderer = ChromePdfRenderer()
renderer.RenderingOptions.PaperSize = PdfPaperSize.Custom
renderer.RenderingOptions.SetCustomPaperSizeInInches(5.0, 5.0)

pdf = renderer.RenderHtmlAsPdf(html)

pdf.SaveAs("CustomPaperSize.pdf")