The quickest way to change what you see on your screen

On a Mac, "screen size" usually means one of two things: the resolution (how many pixels fit on your display), or the scaling (how large the text and icons appear). Most people want to make things bigger or smaller without buying a new monitor. You do this through System Settings, and the steps take less than a minute.

If you use an external monitor, you can change each display separately. If you're on a laptop, you're adjusting the built-in screen. Either way, the process is the same: open System Settings, find Displays, and move a slider.

Key Takeaways

  • Resolution and scaling are different: resolution is how many pixels your Mac sends to the screen, and scaling is how large those pixels appear to your eye.
  • Most Macs let you choose between "More Space" (smaller text, more fits on screen) and "Larger Text" (bigger text, less fits on screen).
  • You reach display settings through System Settings > Displays, and changes take effect when ready.
  • If you have an external monitor, you can set each display to different sizes independently.
  • Restarting your Mac is rarely necessary after changing screen size, but some apps may need to be closed and reopened to see the change.

How to change screen size on a Mac with System Settings

Open System Settings by clicking the Apple menu in the top-left corner and selecting System Settings. (On older Macs running Big Sur or earlier, it's called System Preferences.)

Click Displays in the sidebar. If you don't see it, click the magnifying glass at the top, type "Displays," and select it from the results.

Look for the Resolution section. You'll see a row of buttons or a slider labeled "Scaled" with options like "More Space," "Default," and "Larger Text." Click the one you want. "More Space" shrinks everything so more fits on your screen. "Larger Text" enlarges everything. "Default" is Apple's recommendation for your specific monitor.

The change happens when ready. Close System Settings and you're done.

What resolution and scaling actually do

Your Mac sends a certain number of pixels to your monitor every moment. That number is the resolution. A common resolution is 1920 by 1080 pixels (often written 1920×1080). A higher resolution means more pixels, which means more things fit on your screen at once, but they appear smaller.

Scaling is what your Mac does to make those pixels look the right size to your eye. If your monitor is small, your Mac might scale up the pixels so text isn't tiny. If your monitor is large, your Mac might scale them down so you're not squinting at huge icons. When you move the slider in System Settings, you're usually changing the scaling, not the resolution itself.

On newer Macs (2017 and later), you typically see scaling options like "More Space" and "Larger Text" rather than raw resolution numbers. On older Macs, you might see both. Either way, the goal is the same: make what you see comfortable to work with.

Changing size on an external monitor

If you've plugged in an external display, System Settings shows a separate Displays panel for each one. Click the dropdown at the top of the Displays panel and select which monitor you want to adjust. Then move the scaling slider for that monitor alone.

You can set your laptop screen to "Larger Text" and your external monitor to "More Space" at the same time. Each display remembers its own setting, so when you unplug the external monitor and plug it back in later, it returns to the size you chose.

If your external monitor isn't showing up in System Settings, make sure the cable is fully seated and the monitor is powered on. Some older monitors need a moment to be recognized. If it still doesn't appear, restart your Mac.

When to use More Space versus Larger Text

"More Space" is useful if you work with documents, spreadsheets, or code where you want to see as much as possible at once. It shrinks the interface, so your menu bar, toolbars, and windows take up less room. The trade-off is that text and buttons become smaller and can be harder to read if you sit far from the screen.

"Larger Text" makes everything bigger, which helps if you have vision difficulties or prefer not to lean in close. It means fewer windows fit on your screen at once, but what you see is clearer. Most people find this the most comfortable for everyday work.

"Default" is Apple's middle ground for your specific monitor size and resolution. It's a safe choice if you're unsure.

Troubleshooting when the change doesn't look right

If you change the screen size and text looks blurry or fuzzy, you may have chosen a resolution your monitor doesn't handle well. Go back to Displays, try a different scaling option, and see if it clears up. Modern monitors are usually sharp at any of the offered sizes, but older external displays sometimes have a "native" resolution where they look best.

If an app doesn't resize properly after you change the screen size, close the app completely and reopen it. Most apps read the screen size when they launch, so restarting them forces them to adjust.

If you change the size and suddenly can't see the menu bar or your windows are cut off, your Mac may have applied a resolution your monitor can't display. Restart your Mac and hold down the power button until you see "Loading startup options." Click Options, then System Settings, and try a different resolution.

Changing screen size on older Macs

On Macs running Big Sur (11) or earlier, open System Preferences instead of System Settings. The process is identical: click Displays, then choose your resolution from the list. Older Macs often show resolution as numbers (like 1920×1080) rather than "More Space" and "Larger Text," but the effect is the same.

If your older Mac has a Retina display (a high-pixel-density screen), you'll see options marked with an @ symbol, like "1920×1200 (Retina)." These are scaled resolutions. Choose whichever makes text comfortable to read.

Frequently Asked Questions

Can I set a custom screen size that's not in the list?

Not through System Settings. Apple limits you to resolutions it has tested with your specific monitor. If none of the options feel right, try each one for a day or two—your eyes often adjust. If you truly need a custom resolution, third-party tools exist, but they can cause display problems and aren't supported by Apple.

Will changing screen size affect my files or documents?

No. Changing the display size only changes what you see on screen. Your files, photos, and documents stay exactly the same. If a document looked a certain way before, it will look the same way after you change the screen size—it will just appear larger or smaller on your monitor.

Why does my screen look blurry after I change the size?

You may have chosen a resolution your monitor doesn't support well. Go back to Displays and try a different option. If you're using an external monitor, make sure the cable is a good quality and fully connected. Loose or damaged cables sometimes cause blurriness.

Do I need to restart my Mac after changing screen size?

No. The change takes effect when ready. You only need to restart if something goes wrong—like if the screen becomes unreadable or an app stops responding.

Can I make just the text bigger without making everything else bigger?

Not through display settings. However, most apps let you zoom in on text independently. In web browsers, press Command and the plus key to enlarge just the page. In Word or Pages, use the zoom slider in the toolbar. This is often easier than changing your whole screen size.