Resize PDF Files to Same Page Size Using Python

resize-pdf.py

from PyPDF2 import PdfFileReader, PdfFileWriter
from PyPDF2.pdf import PageObject
from pathlib import Path

pdf_file = Path.home() / 'Downloads' / 'General harmony - practical, analysis and principle.pdf'
pdf_reader = PdfFileReader(str(pdf_file))
writer = PdfFileWriter()

# assume page 0 is the desired size
page0 = pdf_reader.getPage(0)
h = float(page0.mediaBox.getHeight())
w = float(page0.mediaBox.getWidth())

for page in pdf_reader.pages:
    new_page = PageObject.createBlankPage(None, w, h)
    new_page.mergeScaledTranslatedPage(page, min(h/float(page.mediaBox.getHeight()), w/float(page.mediaBox.getWidth())), 0, 0)
    writer.addPage(new_page)

with Path("resize.pdf").open("wb") as out_pdf:
	writer.write(out_pdf)