Is it possible to change the size of the font in a .pdf?



My widescreen monitor have an excess of unused space in the laterals. Zoom creates a constant effort to press space-bar and still doesn't solve the problem of unused space or simply exaggerate the proper size.
A solution was to rotate the pdf, and rotate physically the position of the monitor, from horizontal to vertical. It's a horrible solution anyway.



While ebooks with proper fontsize works perfectly due the possibility of "facing pages" or "overview", that shows several pages on the monitor instead of one-page-only, .pdfs who have minuscule fontsize makes the reading exhausting.

I'm not talking about pdf editing software, but a simply option on Okular who sets the fontsize as a forced default.

Not really. PDFs are generally more like vector graphics, and there's no reasonable way to change the text layout unfortunately.
Your PDF looks like a scan, which means it's basically a regular image, like a photo.

Greetings!