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How to zoom in and out in Photoshop
Once you get rolling with Photoshop, zoom becomes an essential function for inspecting details. You’ve got a few options for controlling zoom though, including matching content to your screen size.
QUICK ANSWER
Select the Zoom tool in the lefthand toolbar. Click on an area to zoom in, and Alt- or Option-click to zoom out. To go back to default zoom, hit Control-1 in Windows or Command-1 on a Mac.
JUMP TO KEY SECTIONS
How to zoom in or out in Photoshop
Much of the time, you’ll find it easiest to use the Zoom tool (a magnifying glass) in the lefthand toolbar. Select it and click on an area in the canvas to zoom in. Use Alt- or Option-click to zoom out.
For a more basic zoom, hold down the Z key, then click and drag your cursor to the left or right to adjust magnification.
If you want to use your mouse’s scroll wheel, go to Edit > Preferences > Tools and toggle Zoom with Scroll Wheel. Alternately you can hold down Alt or Option (on Macs) to temporarily activate wheel zoom.
How to zoom in to fit the screen
If you want to fill as much of your canvas as possible with an image while seeing its entirety, hit Control-O (in Windows) or Command-O (on a Mac). As a fallback, use View > Fit on Screen.
How to reset the image zoom to 100%
To return to the default view of an image, hit Control-1 in Windows or Command-1 on a Mac. The menu equivalent is View > 100%.
Read more: How to merge layers in Photoshop