Zoom 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: » Get The Tip of The Day in Your Inbox! Sign-up for the PTC Newsletter to receive a weekly re-cap of the Tips of The Day. That way you'll never miss a tip. You'll also get instant access to the Subscriber Only Tutorials! Enter your email below to sign up! Your Email Address: You Can Also Get Daily Tips On Your Feed! Every Photoshop Tip of The Day is posted in our Facebook & Google Plus, Twitter, LinkedIn, and Pinterest pages.