Add, Rotate, Crop, Merge & Split PDF Files in Python using pypdf Library. Check https://products.documentprocessing.com/merger/python/pypdf/ for more details.

add-rotate-and-crop-pdf-pages-in-python-using-pypdf-library.py

# Import the PdfWriter & PdfReader classes from the pypdf library
from pypdf import PdfWriter, PdfReader

# Open PDF document and instantiate writer object for performing operations on the PDF
reader = PdfReader("documentprocessing.pdf")
writer = PdfWriter()

# Add page 1 from reader to output document, unchanged:
writer.add_page(reader.pages[0])

# Add page 2 from reader, but rotated clockwise 90 degrees:
writer.add_page(reader.pages[1].rotate(90))

# Add page 3 from reader, but crop it to half size:
page3 = reader.pages[2]
page3.mediabox.upper_right = (
    page3.mediabox.right / 2,
    page3.mediabox.top / 2,
)
writer.add_page(page3)

# Add some Javascript to launch the print window on opening this PDF.
# The password dialog may prevent the print dialog from being shown,
# Comment the the encription lines, if that's the case, to try this out:
writer.add_js("this.print({bUI:true,bSilent:false,bShrinkToFit:true});")

# Write to document-output.pdf
with open("pypdf-output.pdf", "wb") as fp:
    writer.write(fp)

merge-pdf-files-in-python-using-pypdf-library.py

# Import the PdfWriter class from the pypdf library
from pypdf import PdfWriter

# Create a PdfWriter object to merge PDFs
merger = PdfWriter()

# List of PDF files to be merged
pdf_files = ["documentprocessing.pdf", "data.pdf"]

# Iterate through the PDF files and append them to the merger
for pdf in pdf_files:
    merger.append(pdf)

# Write the merged PDF to a new file named "merged-pdf.pdf"
merger.write("merged-pdf.pdf")

# Close the merger object
merger.close()

split-pdf-documents-in-python-using-pypdf-library.py

# Import the PdfWriter & PdfReader classes from the pypdf library
from pypdf import PdfReader, PdfWriter

# Open the PDF Document
input_pdf = PdfReader(open("1.pdf", "rb"))

# Split the PDF into two parts
mid_page = int(len(input_pdf.pages) / 2)

first_half = PdfWriter()
second_half = PdfWriter()

for page_num in range(mid_page):
    first_half.add_page(input_pdf.pages[page_num])

for page_num in range(mid_page, len(input_pdf.pages)):
    second_half.add_page(input_pdf.pages[page_num])

# Save the two halves to the same directory
output_file1 = 'first_half.pdf'
output_file2 = 'second_half.pdf'

with open(output_file1, 'wb') as output1:
    first_half.write(output1)

with open(output_file2, 'wb') as output2:
    second_half.write(output2)