Home » Tip of The Day » Zoom In And Out Keyboard ShortcutsZoom In And Out Keyboard Shortcuts May 4, 2016. Posted in: Tip Of The Day. To zoom in/out, press Ctrl (Mac: Command) and the + (plus)/ – (minus) key or hold Alt (Mac: Option) and scroll with the mouse-wheel. « Previous Photoshop Tip: | Next Photoshop Tip: » Sign-up for the PTC Newsletter so that you'll never miss a tutorial!. Your Email Address: