The PaperSize Class .. autoclass:: pypdf.PaperSize :members: :undoc-members: :show-inheritance: Add blank page with PaperSize from pypdf import PaperSize, PdfWriter writer = PdfWriter(clone_from="sample.pdf") writer.add_blank_page(PaperSize.A8.width, PaperSize.A8.height) with open("output.pdf", "wb") as output_stream: writer.write(output_stream) Insert blank page with PaperSize from pypdf import PaperSize, PdfWriter writer = PdfWriter(clone_from="sample.pdf") writer.insert_blank_page(PaperSize.A8.width, PaperSize.A8.height, 1) with open("output.pdf", "wb") as output_stream: writer.write(output_stream)