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Boboin's avatar
Boboin
Iron Contributor
Mar 07, 2025
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How can I add logo watermark in pdf file on Windows 11?

Hi everyone, I'm indie author who is just getting started. I recently finished an ebook and would like to add my personal logo as a watermark or cover element in my own PDF version. However, I'm not ...
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Princellcp's avatar
Princellcp
Iron Contributor
Mar 07, 2025

Adding logo or watermark to PDF is a simple way to protect the book and let us know the author. Actually, you can do it for free with the python script on Windows 11 PC. You can go and run this python script to add logo to PDF on any Windows PC.

from PyPDF2 import PdfReader, PdfWriter
from PIL import Image

def add_logo(input_pdf, logo_path, output_pdf):
    pdf = PdfReader(input_pdf)
    logo = Image.open(logo_path).convert("RGBA")
    
    writer = PdfWriter()
    for page in pdf.pages:
        page_image = page.to_image(resolution=300)  
        page_image.paste(logo, (100, 100), logo)  
        writer.add_page(page_image)
    
    with open(output_pdf, "wb") as out_file:
        writer.write(out_file)

add_logo("input.pdf", "logo.png", "output.pdf")

 

Notes

  1. Transparent background processing: Make sure the logo is in PNG format and retain the transparent channel.
  2. Performance Optimization: When processing large PDFs, it is recommended to test a small sample file first.
  3. Permission Issues: It may be necessary to run CMD/PowerShell with administrator privileges.

Please feel free to add additional notes if you need to further help to add watermark to pdf files.

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