The fastest way to change your Mac background

Open System Settings (or System Preferences on older Macs), click Wallpaper in the sidebar, then select your desktop and pick a new image. The change takes effect when ready. If you want to use your own photo instead of Apple's built-in options, click the + button, navigate to your image file, and click Open.

The whole process takes under a minute. You can also right-click directly on your desktop, select Change Desktop Background, and skip opening System Settings entirely — both routes lead to the same place.

Key Takeaways

  • System Settings > Wallpaper is the main control panel for desktop backgrounds on all recent Mac models.
  • You can use Apple's built-in image collections or add your own photos by clicking the + button and selecting a file.
  • Right-clicking your desktop and choosing Change Desktop Background opens the same wallpaper panel without opening System Settings.
  • Changes appear on your desktop when ready; you do not need to restart or log out.
  • You can set different backgrounds for your main display and external monitors if you have multiple screens connected.

Opening System Settings on your Mac

Click the Apple menu in the top-left corner of your screen, then select System Settings. On Macs running macOS Monterey or older, the option is called System Preferences instead — the location and function are identical.

Once System Settings opens, look for Wallpaper in the sidebar on the left. Click it. If you do not see a sidebar, your window may be too narrow — drag the edge of the window wider and the sidebar will appear.

Choosing from Apple's built-in backgrounds

The Wallpaper panel shows categories of images: Dynamic, Light, Dark, and Collections. Click any category to see thumbnails of available backgrounds. Hover over an image to preview it on your desktop in real time — you will see the change happen behind the settings window.

Click the image you want to keep. It applies to your desktop when ready. If you have multiple displays connected, you will see separate sections for each one, so you can set different backgrounds on each screen.

Adding your own photos as a background

To use a photo from your computer, click the + button at the bottom of the Wallpaper panel. A file browser opens. Navigate to the folder containing your photo — usually Pictures or Downloads — and click the image file you want.

Click the Open button. Your photo appears in the Wallpaper panel and becomes your desktop background. If the image is smaller than your screen resolution, macOS will stretch it to fit; if it is larger, it will crop to fit. For best results, use a photo that is at least as wide and tall as your screen resolution.

Using the desktop right-click shortcut

Right-click anywhere on your desktop (not on a file or folder icon) and select Change Desktop Background from the menu that appears. This opens the same Wallpaper panel as going through System Settings, but saves you a few clicks.

This method is faster if you are already at your desktop and do not have System Settings open. The rest of the process — browsing, previewing, and selecting — works exactly the same way.

Fixing a background that looks stretched or blurry

If your new background looks distorted or pixelated, the image resolution is probably too small for your screen. Check the image dimensions: right-click the photo file, select Get Info, and look for the pixel dimensions listed under More Info. Compare those numbers to your screen resolution (found in System Settings > Displays).

If the image is smaller than your screen, try a different photo or find a higher-resolution version. macOS cannot enlarge a small image without losing quality, so starting with a large image prevents this problem. For a standard 27-inch display, use an image at least 2560 × 1440 pixels.

Setting different backgrounds for multiple displays

If you have an external monitor or projector connected to your Mac, the Wallpaper panel shows a separate section for each display. Click the display you want to change — it will be labeled by size or name — then select a background for that screen.

You can set the same background on all displays or choose a different one for each. The settings save independently, so changing one display's background does not affect the others.

Frequently Asked Questions

Can I set a different background for each space or desktop?

No. macOS applies the same background to all spaces and virtual desktops. If you switch between multiple desktops, they will all show the same wallpaper. You can only change the background globally, not per-space.

What if I deleted a photo I was using as a background?

If the photo no longer exists on your computer, macOS will revert to a default Apple background the next time you restart or log out. You can set a new background anytime by opening Wallpaper settings again.

How do I remove a background I added from the plus button?

Right-click the background in the Wallpaper panel and select Remove. This removes it from your wallpaper options but does not delete the original photo file from your computer.

Can I make my background change automatically throughout the day?

Yes. In the Wallpaper panel, select Dynamic from the categories on the left. Dynamic backgrounds shift their appearance based on the time of day. You can also select the Light or Dark collections, which change when your Mac switches between light and dark mode.

Why is my background not showing on my lock screen?

Desktop background and lock screen background are separate settings. To change your lock screen, go to System Settings > Lock Screen and select a new image there. The lock screen does not automatically match your desktop background.