Split each PDF page in two?

Question

I have a large number of PDF files which have two slides to a page (for printing).

The format is A4 pages each with two slides setup like so:

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Answer 1

mutool works brillantly for this. The example below will chop each page of input.pdf into 3 horizontal and 8 vertical parts (thus creating 24 pages of output for each 1 of input):

mutool poster -x 3 -y 8 input.pdf output.pdf

To install mutool, just install mupdf, which is probably packaged with most GNU/Linux distributions.

(Credits to marttt.)

On debian based linux systems like ubuntu, you can install it using

sudo apt install mupdf
sudo apt install mupdf-tools