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Last active April 15, 2024 19:55
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Split a PDF vertically, used for scanned double sided PDF pages
# Source
import copy
import sys
import math
import pyPdf
def split_pages(src, dst):
src_f = file(src, 'r+b')
dst_f = file(dst, 'w+b')
input = pyPdf.PdfFileReader(src_f)
output = pyPdf.PdfFileWriter()
for i in range(input.getNumPages()):
p = input.getPage(i)
q = copy.copy(p)
q.mediaBox = copy.copy(p.mediaBox)
x1, x2 = p.mediaBox.lowerLeft
x3, x4 = p.mediaBox.upperRight
x1, x2 = math.floor(x1), math.floor(x2)
x3, x4 = math.floor(x3), math.floor(x4)
x5, x6 = math.floor(x3/2), math.floor(x4/2)
if x3 > x4:
# horizontal
p.mediaBox.upperRight = (x5, x4)
p.mediaBox.lowerLeft = (x1, x2)
q.mediaBox.upperRight = (x3, x4)
q.mediaBox.lowerLeft = (x5, x2)
# vertical
p.mediaBox.upperRight = (x3, x4)
p.mediaBox.lowerLeft = (x1, x6)
q.mediaBox.upperRight = (x3, x6)
q.mediaBox.lowerLeft = (x1, x2)
input_file=raw_input("Enter the original PDF file name :")
output_file=raw_input("Enter the splitted PDF file name :")
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proteusvacuum commented Jul 9, 2017

This was very helpful!
The pages get added back out of order, it should be:


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தேடுபொறி வழியே இதனை அடைந்தேன். செய்து பார்த்த பொழுது, கிடைமட்டமாக (horizandally) வெட்டுகிறது. செங்குத்தாக (vertical) வெட்ட என்ன செய்ய வேண்டும்?

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ghost commented Apr 11, 2021

This is the error I get every time:

Python 3.9.0 (v3.9.0:9cf6752276, Oct 5 2020, 11:29:23)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license()" for more information.

= RESTART: /Users/leonardo/Desktop/23d8e4986cbae49b8a8c-a6c29d599bb96b5a84718ee732d330327afb46d0 2/
Traceback (most recent call last):
File "/Users/leonardo/Desktop/23d8e4986cbae49b8a8c-a6c29d599bb96b5a84718ee732d330327afb46d0 2/", line 6, in
import pyPdf
ModuleNotFoundError: No module named 'pyPdf'

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tshrinivasan commented Apr 12, 2021 via email

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zzaibis commented Jun 24, 2021

src_f = file(src, 'r+b')

Where do I get this function from "file"? What is this "file" referencing to?

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Majk720 commented Oct 9, 2021

Can anyone help me how to do this on linux? I have no idea how to use it. I have installed pdf module and pyPDF module

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breedx2 commented Jan 3, 2024

Hacked up a 2024 update that uses python3 and newer library conventions:
Thanks for the original! Cheers.

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