How to Use the Trackpad to Zoom on a Mac

You can zoom in on a document, web page, photo, or other item by placing two fingers on your trackpad and moving them apart. You can zoom back out by pinching your fingers together. The zoom gestures can be enabled or disabled from the...

Part 1 of 2:

Open something that can be zoomed. You can change the zoom on web pages, pictures, documents, and more. You won't be able to zoom on the desktop or in Finder.
Place two fingers on the trackpad.
Move your two fingers apart to zoom in.
Pinch your two fingers together to zoom out.
Double-tap two fingers to zoom in on your cursor. Double-tap your two fingers again to zoom out. This will magnify the part of the document or web page that your cursor is over.^[1]

Part 2 of 2:

Click the Apple menu. You can find this in the upper-left corner of the screen.
Click System Preferences.
Click Trackpad. If you don't see this option, click the Show All button at the top of the window.
Click the Scroll & Zoom tab.
Click the Zoom in and out box. This will toggle the ability to pinch zoom on or off.
Click the Smart zoom box. This will toggle the ability to double-tap two fingers to smart zoom on or off.