The fastest way to change your Mac background

Open System Settings (or System Preferences on older Macs), click Wallpaper in the sidebar, then select a new image from the gallery or click Add to use your own photo. The change takes effect when ready on your desktop and lock screen. The whole process takes under a minute.

If you want different images on your desktop and lock screen, or if you prefer to use a folder of photos that rotate automatically, you can set those options in the same menu. This guide walks you through each method so you can choose what works for your setup.

Key Takeaways

  • System Settings > Wallpaper is the main control panel for background images on any recent Mac.
  • You can use Apple's built-in image library, your own photos, or a folder of images that change on a schedule.
  • Desktop and lock screen backgrounds can be set separately or matched to the same image.
  • If System Settings does not show a Wallpaper option, your Mac is older and uses System Preferences instead, but the steps are nearly identical.

Opening System Settings and finding the Wallpaper menu

Click the Apple menu in the top-left corner of your screen and select System Settings. On Macs running macOS Monterey or earlier, this menu is called System Preferences instead. Either way, the icon looks like a gear.

Once System Settings opens, look for Wallpaper in the sidebar on the left. Click it. If you do not see Wallpaper listed, scroll down in the sidebar — it may be below the fold. On very old Macs, you may need to look under Desktop & Screen Saver instead.

Choosing a background from Apple's built-in collection

The Wallpaper menu shows several categories of images: Dynamic (which change throughout the day), Light, Dark, and Collections. Click any category to see thumbnails of available images. Hover over an image to preview it larger, then click it once to explore it to your desktop when ready.

If you want the same image on both your desktop and lock screen, make sure both are set to the same choice. You can also set them separately — for example, a photo on your desktop and a solid color on your lock screen. Look for dropdown menus or tabs labeled Desktop and Lock Screen depending on your macOS version.

Using your own photos as a background

To use a photo from your computer instead of Apple's library, click the Add button (usually a plus sign) at the bottom of the Wallpaper menu. A file browser opens. Navigate to the folder where your photo is stored — most people keep photos in the Pictures folder — and click the image you want. Click Add or Choose to confirm.

The image appears in your Wallpaper menu and is applied to your desktop or lock screen right away. You can now use this image again in the future by clicking it in the menu without having to browse for it each time. If you want to remove a custom image from the menu later, right-click it and select Remove.

Setting up automatic background rotation

If you want your background to change automatically, select a folder of images instead of a single photo. Click Add, navigate to a folder containing multiple images, and click Add Folder (not a single image file). Your Mac will now cycle through all the images in that folder.

After you add a folder, look for a dropdown menu that says something like Change picture or Rotation. Click it and choose how often you want the image to change: every 30 seconds, every minute, every 5 minutes, every hour, every day, or when you wake your Mac. This is useful if you have a collection of photos and want variety without manually switching backgrounds.

Troubleshooting common problems

If your background does not change after you select a new image, try clicking the image again or restarting your Mac. Sometimes the display does not refresh when ready, especially if you have multiple monitors. If you are using a very large image file (over 50 MB), your Mac may take a few seconds to process it.

If you cannot find the Wallpaper option in System Settings, check your macOS version. Press the Apple menu and select About This Mac to see which version you are running. On macOS Monterey and earlier, the option is under System Preferences > Desktop & Screen Saver. The steps are the same, but the menu layout is slightly different. If you are still stuck, try restarting System Settings by closing it completely and opening it again.

Setting different backgrounds for multiple monitors

If you have more than one monitor connected to your Mac, you can set a different background on each one. In the Wallpaper menu, look for a dropdown or tab that lets you choose which monitor to adjust. Select the first monitor, pick an image, then switch to the second monitor and pick a different one. Each monitor remembers its own background independently.

Some older Macs or external monitor setups may not support per-monitor backgrounds. If you do not see an option to choose which monitor, your setup may only allow one background across all displays. In that case, the image you select will stretch or tile across all connected screens.

Frequently Asked Questions

Can I use a photo from the internet as my background?

Yes. Right-click the image in your web browser and select Save Image As. Choose a folder (Pictures is easiest to find later) and click Save. Then follow the steps above to add it as a background using the Add button in Wallpaper settings.

Why does my background look blurry or stretched?

This usually happens when the image size does not match your screen resolution. Your Mac will stretch or shrink the image to fit. For the sharpest result, use an image that is at least as wide and tall as your screen resolution. You can check your screen resolution in System Settings > Displays.

How do I go back to the default Apple background?

Open Wallpaper settings and click any of the built-in collections (Dynamic, Light, or Dark). Select one of Apple's standard images. Your Mac will switch back to it when ready. You have not deleted anything — the default images are always available in the menu.

Can I set a background that changes based on the time of day?

Yes. In the Wallpaper menu, click the Dynamic category. These images shift their appearance throughout the day to match sunrise, midday, and sunset lighting. Select one and it will change automatically without you having to do anything.

What image file types does Mac support for backgrounds?

Mac supports JPEG, PNG, HEIF, TIFF, and GIF files as backgrounds. Most photos from your camera or phone are already in one of these formats. If you have an image in a different format (like BMP or WebP), you can convert it using free online tools or image editing software before setting it as your background.