I have a PDF of a hymn book that I want to convert to 2-up so I can use it that way on my reMarkable which only supports single-page display and not two-page spreads; but I also want all the internal hyperlinks (to and from a table of contents) to keep working. I haven’t found any software that seems capable of doing this (though I’ve only looked at FOSS; wouldn’t surprise me if something Adobe could do it). The closest I seem to have found is qpdf which might be able to do it with some programming effort.

Is that sort of thing going to be in scope for this library’s editing capabilities? (“Editing PDFs” is such a broad, open-ended thing.)