Scale_PDF_pages.ipynb

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    "Author: Sohrab\n",
    "\n",
    "git: https://github.com/sohrabganjian\n",
    "\n",
    "requirements: pypdf\n",
    "\n",
    "The following is the code for merging\n",
    "scaling pages of a given pdf to letter size (612 × 792 points)\n",
    "\n",
    "https://en.wikipedia.org/wiki/Point_(typography)\n",
    "\n",
    "Convert point to cm: https://www.unitconverters.net/length/point-to-centimeter.htm\n",
    "\n",
    "Sizes of paper, expressed in points:\n",
    "https://www.prepressure.com/library/paper-size"
   ]
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    "import pypdf\n",
    "from pypdf import PdfReader, PdfWriter\n",
    "\n",
    "# Name the input PDF\n",
    "pdf = \"input.pdf\"\n",
    "\n",
    "# Name the output PDF\n",
    "output_pdf = \"output scaled.pdf\"\n",
    "\n",
    "# Open the input PDF file\n",
    "with open(pdf, 'rb') as file:\n",
    "    readpdf = PdfReader(file)\n",
    "    totalpages = len(readpdf.pages)\n",
    "\n",
    "pdf = PdfReader(pdf)\n",
    "\n",
    "# Create a single output PDF writer\n",
    "output_writer = PdfWriter()\n",
    "\n",
    "for i in range(totalpages):\n",
    "    page = pdf.pages[i]\n",
    "    page_width = page.mediabox.width\n",
    "    page_height = page.mediabox.height\n",
    "    scale_factor = min(792 / page_height, 612 / page_width) # change 792 and 612 based on paper size\n",
    "    page.scale_by(scale_factor)\n",
    "    output_writer.add_page(page)\n",
    "\n",
    "\n",
    "with open(output_pdf, \"wb+\") as f:\n",
    "    output_writer.write(f)"
   ]
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