FYI: Similar functionality (`mutool poster -y 2`)

[matomatical]

Just in case you are interested, the mutool pdf utility (part of mupdf, documentation here) has a similar command to slice up a PDF. The relevant usage would be something like:

mutool poster -y 2 <input path> <output path>

(-y 2 = slice each page vertically into 2 pages)

Pros:

• Seems a little faster (for the one small example I tried)
• Doesn't seem to double the size of the pdf file (for the one small example I tried)

Cons:

• There is no 'overlap' included by default (but I think the reMarkable might still show some overlap, depending on the aspect ratio)

[axkibe]

but I think the reMarkable might still show some overlap, depending on the aspect ratio

It doesn't. (at least on A4)