>>1541735
https://unix.stackexchange.com/questions/439959/how-to-reverse-the-page-order-of-a-pdf-file
first suggestion recommends: pdftk myfile.pdf cat end-1 output myfilereversed.pdf
Then if you want to do it for multiple files, just in the directory with files create directory "reversed" and run something like:
for f in *.pdf; do pdftk $f cat end-1 output reversed/$f ; done
that should work on linux or mac, if you use windows it should be more or less similar, just ask chatgpt to tell you how to do same with cmd or powershell

>>1541744
thanks, going to check that out at the office tomorrow.
I guess I'll have to try it with cmd or powershell because we use windows there.

I suggest testing your script with spare copies of some of the pdfs to ensure your command doesn't modify/delete your source pdfs (lest you lose your only copies of a scan).
(An alternative to pdftk is qpdf. Though I suppose pdftk has cleaner syntax.
The command to reverse one pdf is qpdf --empty --pages file.pdf z-1 -- output.pdf)

>>1541822
>>1541744
tested with the pdftk, installed the free version, the program asked to pay for use, but I could use it with a command line like the first answer said, I was preppared to get the filenames on some script to automatically sort them, but then they said they didn't do it backwards, but in complete disorder, and it wasn't actually that many files, just like 20 files with around 500 pages each (they gave me wrong info or exagerated "a bit" for whatever reason), so they opted to manually sort them with adobe (they have a licence for that), thank you all for your help anyways, at least I learnt how to do that.

>>1541872
>have to manually sort 20x500 pages
grim. Hopefully they're numbered