@triadne
What is „inch“?
Printer don‘t have pixles but dots.
Fonts don‘t have dots but vectors.

PDF files contain pages of a certain size.
The size are set by the creator
ussually in cm / mm or even exotic units.
The maximum is <see previous toot>.
Printet sheets show the page content 1:1
or scaled otherwise.
The more DPI is printed, the better it looks.