A given, created, PDF, is fixed to whatever size it was created to represent.
Acrobat claims to be able to "reflow" some PDF's, but whatever it is doing is more black magic voodoo than anything else, given how text layout is represented inside the PDF format.
The text layout becomes (essentially) a stream of instructions to "move current point to 123,456" and "place this text at current point". And the numerical values used are tied directly to the page size and internal "point size" used by the PDF writing software. I.e, the text is simply "physically positioned" on a virtual x,y canvas.
There is a practical limit. "Page dimensions are not limited by the format itself. However, Adobe Acrobat imposes a limit of 15 million by 15 million inches, or 225 trillion in2 (145,161 km2)." <https://en.wikipedia.org/wiki/PDF>
A given, created, PDF, is fixed to whatever size it was created to represent.
Acrobat claims to be able to "reflow" some PDF's, but whatever it is doing is more black magic voodoo than anything else, given how text layout is represented inside the PDF format.
The text layout becomes (essentially) a stream of instructions to "move current point to 123,456" and "place this text at current point". And the numerical values used are tied directly to the page size and internal "point size" used by the PDF writing software. I.e, the text is simply "physically positioned" on a virtual x,y canvas.