The PaperSize Class

class pypdf.PaperSize

Bases: object

(width, height) of the paper in portrait mode in pixels at 72 ppi.

A0 = Dimensions(width=2384, height=3370)

A1 = Dimensions(width=1684, height=2384)

A2 = Dimensions(width=1191, height=1684)

A3 = Dimensions(width=842, height=1191)

A4 = Dimensions(width=595, height=842)

A5 = Dimensions(width=420, height=595)

A6 = Dimensions(width=298, height=420)

A7 = Dimensions(width=210, height=298)

A8 = Dimensions(width=147, height=210)

C4 = Dimensions(width=649, height=918)

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)