The fastest way to change your Mac wallpaper

Open System Settings, click Wallpaper in the left sidebar, then select a new image from the gallery or upload your own. 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're using an older Mac, the steps vary slightly — but the principle stays the same. You're always working through System Settings (or System Preferences on older machines), and you always have the option to use Apple's built-in images or bring in your own.

Key Takeaways

  • Open System Settings, click Wallpaper, and choose from Apple's gallery or click Add to upload your own image.
  • You can set different wallpapers for your desktop and lock screen, or use the same image for both.
  • Wallpaper images work best at your Mac's native resolution, though the system will scale images that don't match.
  • On older Macs running Big Sur or earlier, use System Preferences instead of System Settings, but the steps are nearly identical.

Opening System Settings and finding the Wallpaper section

Click the Apple menu in the top-left corner of your screen, then select System Settings. On older Macs, this menu item is called System Preferences instead. Wait for the window to open — it usually takes a few seconds.

Once System Settings is open, look for Wallpaper in the left sidebar. Click it. You'll see thumbnails of available wallpapers organized by category: Nature, Solid Colors, Dynamic, and others. If you don't see Wallpaper in the sidebar, scroll down — it's usually near the bottom of the list.

Choosing a wallpaper from Apple's gallery

Click any category to see the images inside it. Hover over an image to see a preview of how it will look on your desktop. Click once to select it. The wallpaper changes when ready on your desktop, and the same image is applied to your lock screen unless you change that separately.

If you want a different image on your lock screen, click the image again after selecting it. A menu will appear with options to set it for your desktop only, lock screen only, or both. Choose what you want, and the change takes effect right away.

Uploading your own wallpaper image

Click the Add button (usually a plus sign) at the bottom of the Wallpaper window. A file browser will open. Navigate to the folder where your image is saved, select it, and click Open. The image is added to your wallpaper options and applied to your desktop when ready.

Your Mac accepts most common image formats: JPEG, PNG, HEIF, and TIFF all work. The image doesn't need to match your screen resolution exactly — the system will scale it to fit. However, images that are close to your Mac's native resolution (2560 × 1600 for a 16-inch MacBook Pro, for example) will look sharper than smaller images stretched to fill the screen.

Setting different wallpapers for desktop and lock screen

After you select a wallpaper, click it again to open the menu. You'll see three options: Set Desktop, Set Lock Screen, or Set Both. Choose Set Desktop to use that image only on your desktop, or Set Lock Screen to use it only on your lock screen. Choose Set Both to explore it to both.

This means you can have a professional image on your lock screen and something more personal on your desktop, or vice versa. Each setting is independent — changing your desktop wallpaper won't affect your lock screen unless you explicitly choose Set Both.

Wallpaper settings on older Mac models

If your Mac is running macOS Big Sur (version 11) or earlier, the steps are almost identical, but you'll use System Preferences instead of System Settings. Click the Apple menu, select System Preferences, then look for Desktop & Screen Saver in the sidebar. Click it, then select the Desktop tab.

The wallpaper options and upload process work the same way. You can still choose from Apple's gallery, upload your own images, and set different wallpapers for your desktop and screen saver. The main difference is the name of the settings app and the organization of the sidebar — the functionality is the same.

Troubleshooting wallpaper problems

If a wallpaper doesn't appear after you select it, try closing System Settings and opening it again. Sometimes the display takes a moment to refresh, especially if you're using an external monitor. If the image looks blurry or pixelated, it may be smaller than your screen resolution — try a larger image file.

If you upload an image and it doesn't show up in your wallpaper options, make sure the file is in a format your Mac recognizes (JPEG, PNG, HEIF, or TIFF). Files with unusual extensions or corrupted image data won't appear. You can also try dragging the image directly onto the Wallpaper window instead of using the Add button — this sometimes works when the file browser doesn't.

Frequently Asked Questions

Can I use a photo from my Photos library as wallpaper?

Yes. In System Settings, click Wallpaper, then look for a Photos category or option. Click it, and you can browse your Photos library directly. Select any photo and it becomes your wallpaper. This is faster than exporting the photo and uploading it separately.

What size should my wallpaper image be?

Your Mac's native resolution is ideal. For a 16-inch MacBook Pro, that's 3456 × 2234 pixels. For a 13-inch MacBook Air, it's 2560 × 1600. Your Mac will scale any image to fit, but images close to these sizes will look sharpest. You can find your screen resolution in System Settings under Displays.

Will changing my wallpaper affect my external monitor?

If you're using an external monitor, you can set different wallpapers for your Mac's built-in display and the external monitor. In System Settings, click Wallpaper, then look for options to choose which display the wallpaper applies to. This is useful if you want a work image on your external monitor and something personal on your laptop screen.

Can I set a wallpaper that changes throughout the day?

Yes. Apple offers Dynamic wallpapers that shift appearance based on the time of day. In System Settings, click Wallpaper, then select the Dynamic category. These images automatically adjust from morning to evening without any action from you. They're built into macOS and don't require an internet connection.