How to Merge PDF Files with Python Scripting Techniques?

Merge PDF Files with Python

File Concatenation

Using PyPDF's PdfMerger class, you can concatenate PDF files simply by appending them:

<code class="python">from pypdf import PdfMerger

pdfs = ['file1.pdf', 'file2.pdf', 'file3.pdf']

merger = PdfMerger()

for pdf in pdfs:
    merger.append(pdf)

merger.write("result.pdf")
merger.close()</code>

File Merging

For finer control, use PdfMerger's merge method to specify insertion points within the output file:

<code class="python">merger.merge(2, pdf)</code>

This inserts the entire PDF at page 2 of the output.

Page Ranges

To control which pages are merged, use the pages keyword argument:

<code class="python">merger.append(pdf, pages=(0, 3))    # first 3 pages
merger.append(pdf, pages=(0, 6, 2)) # pages 1,3, 5</code>

Excluding a Specific Page

To exclude a specific page appearing in all PDFs, you'll need to iterate through each page and check if it's the extra blank page:

<code class="python">for i in range(len(pdfs)):
    num_pages = merger.getPageNumber(i)
    for page_num in range(num_pages):
        page = merger.getPage(i, page_num)
        # Check if page is the extra blank page and exclude it
        exclude = True 
        if exclude:
            merger.deletePage(i, page_num)</code>

Additional Tools

• PyMuPDF: Merge PDFs via command line or code:

  python -m fitz join -o result.pdf file1.pdf file2.pdf file3.pdf

Note: Remember to call PdfMerger's close() method to ensure all files are closed properly.

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