I’m writing a pdf editor in python with 3 function:

1. Delete the last page
2. Delete all blank page
3. Add Water Mark

I used a standard Water Mark subprogram, but the water mark keep been added to the wrong location on a testing pdf. Is there something wrong with the code or the pdf? I’m thinking it’s the pdf

from PyPDF2 import PdfMerger, PdfReader, PdfWriter

pdf_file = "sample.pdf"
watermark = "watermark.pdf"
merged = "result.pdf"

with open(pdf_file, "rb") as input_file, open(watermark, "rb") as watermark_file:
    input_pdf = PdfReader(input_file)
    watermark_pdf = PdfReader(watermark_file)
    watermark_page = watermark_pdf.pages[0]

    output = PdfWriter()

    for i in range(len(input_pdf.pages)):
        pdf_page = input_pdf.pages[i]
        pdf_page.merge_page(watermark_page)
        output.add_page(pdf_page)

    with open(merged, "wb") as merged_file:
        output.write(merged_file)

I saved it on replit.com so you can run it, the pdf is there as well
https://replit.com/@ygp3737/NavyNotedTypes#main.py

pdf