How to merge multiple PDFs into one?

The pypdf library manipulates PDF documents on the page level, e.g. merging two or more PDFs.

Install it with:

pip install pypdf

The following code merges all PDF files from the input path into a single one:

import os
from pypdf import PdfMerger
from pathlib import Path

input_path = Path("input")

merger = PdfMerger()

for fn in os.listdir(input_path):
    if fn.endswith('.pdf'):
      merger.append(open(input_path / fn, "rb"))

output = open("result.pdf", "wb")
merger.write(output)

How to merge multiple images into a PDF

With pypdf you can also merge images into a PDF:

from PyPDF2 import PdfMerger
from PIL import Image


files = [
    "image1.jpg,
    "image2.jpg,
    "image3.jpg,
]
output_pdf = "merged_output.pdf"

merger = PdfMerger()

images = [Image.open(img).convert('RGB') for img in files]

images[0].save(output_pdf, save_all=True, append_images=images)