Fullscreen and zoom controls
Readers do not download your PDF for fun—they zoom when something matters: a footnote, a part number, a diagram. Fullscreen clears the clutter around the viewer so the page is the only thing on screen.
PDF Flip’s toolbar includes zoom and fullscreen so people can inspect detail inside the same session. On a trade-show kiosk, fullscreen also hides browser chrome that distracts from the spread behind the presenter.
Design for magnification
If critical copy lives in the outer margin, aggressive zoom may crop it oddly. Test charts at 125% and 150% on a 13-inch laptop—the size a lot of B2B readers actually use.
Mobile context
Pinch-zoom behaves like other touch web apps; pairing zoom with responsive viewer behavior matters more than any single button size.