Batch watermark PDFs

To batch watermark PDFs, you can use Python with the PyPDF2 or pypdf library for adding watermarks programmatically. Here’s a streamlined Python script using pypdf to watermark all PDFs in a folder:

Steps:

1. Prepare your watermark PDF (a one-page PDF with the watermark text/logo).

2. Place it in the same directory as your PDFs or specify a path.

3. Run the script.

Python Script:

python
CopyEdit
import os
from pypdf import PdfReader, PdfWriter

# Folder with PDFs to watermark
input_folder = "pdfs_to_watermark"
# Watermark file (1-page PDF)
watermark_path = "watermark.pdf"
# Output folder
output_folder = "watermarked_pdfs"

# Ensure output folder exists
os.makedirs(output_folder, exist_ok=True)

# Load the watermark PDF
watermark = PdfReader(watermark_path)
watermark_page = watermark.pages[0]

# Process each PDF in the input folder
for filename in os.listdir(input_folder):
    if filename.lower().endswith(".pdf"):
        input_path = os.path.join(input_folder, filename)
        output_path = os.path.join(output_folder, filename)

        reader = PdfReader(input_path)
        writer = PdfWriter()

        for page in reader.pages:
            page.merge_page(watermark_page)
            writer.add_page(page)

        with open(output_path, "wb") as f:
            writer.write(f)

print("Batch watermarking completed.")

Requirements:

Install pypdf if not already installed:

bash
CopyEdit
pip install pypdf

Notes:

• The watermark PDF should have the same orientation and size as your target documents for best results.

• For transparent watermarks, use a properly designed PDF with alpha transparency.

Let me know if you want to add text-based watermarks directly (without a watermark file).