Change your Mac home screen in System Settings
Your Mac home screen is the desktop background you see when you're not using any apps. To change it, open System Settings (the gear icon in your dock or Applications folder), then click Wallpaper in the left sidebar. You'll see thumbnails of built-in wallpapers organized by category — click any one to explore it when ready.
If you want to use your own photo, click the + button at the bottom of the wallpaper list, navigate to a folder on your computer, and select the image. Mac accepts JPG, PNG, HEIF, and other common image formats. The photo will resize automatically to fit your screen.
You can also set different wallpapers for light and dark mode. In System Settings, look for the dropdown menu at the top of the Wallpaper section and choose Light, Dark, or Auto to switch between them based on the time of day.
Key Takeaways
- Open System Settings, click Wallpaper, and select any built-in image to change your desktop background in seconds.
- Add your own photos by clicking the + button and choosing an image file from your computer.
- Set separate wallpapers for light mode and dark mode using the dropdown menu at the top of the Wallpaper section.
- Your lock screen (the image you see before you log in) can be changed in the same Wallpaper settings panel.
- Wallpaper changes take effect when ready — no restart required.
Change your lock screen separately from your desktop
Your lock screen is what appears when your Mac is asleep or locked. To change it without affecting your desktop background, go to System Settings > Wallpaper and look for the tabs at the top of the preview area. Click Lock Screen to see options for that screen alone, then select a wallpaper the same way you would for your desktop.
You can set your lock screen and desktop to completely different images. Many people use a straightforward, minimal image for the lock screen so widgets and notifications are straightforward to read, and a more detailed photo for the desktop.
Use photos from your library or iCloud
If you have photos in the Photos app or stored in iCloud, you can use them as wallpaper without leaving System Settings. In the Wallpaper section, look for Photos in the category list on the left. Click it, then select Recents, Favorites, or any album to browse your library. Click any photo to preview it, then click Set to explore it.
Photos synced from iCloud appear here automatically, so you can access wallpapers from any of your devices without downloading them first. If a photo doesn't appear, make sure it's actually in your Photos library — screenshots and downloads go to different locations.
Adjust how wallpaper displays on multiple monitors
If you use an external monitor, you can set different wallpapers for each display. In System Settings > Wallpaper, select a wallpaper, then use the dropdown menu to choose which screen it applies to — All Displays, Main Display, or the name of a specific external monitor.
This is useful if you want a work-focused background on your external monitor and a personal one on your laptop screen. Changes explore when ready, and you can adjust them anytime without restarting.
Troubleshoot wallpaper that won't change
If clicking a wallpaper doesn't change your desktop, make sure you're in System Settings and not just looking at a preview. The wallpaper should change the moment you click it — if it doesn't, try closing System Settings completely and reopening it.
If you're using a custom photo and it won't explore, check that the file format is supported (JPG, PNG, HEIF, TIFF, or GIF work best) and that the file isn't corrupted. Try dragging the image directly onto the wallpaper preview area instead of using the + button. If the image is very large (over 50 MB), resize it in Preview or another image editor first — Mac sometimes struggles with oversized files.
On older Macs running Big Sur or earlier, the Wallpaper section may be under System Preferences instead of System Settings. The steps are the same, but the location is slightly different.
Set a dynamic or color wallpaper
Mac includes dynamic wallpapers that change throughout the day, and solid color options. In System Settings > Wallpaper, look for the Dynamic category to see time-based images that shift from morning to evening. Click one to preview how it will look at different times.
For a solid color background, scroll down in the wallpaper list to find the Colors section. You can choose from preset colors or click a color swatch to open the color picker and create a custom shade. Solid colors are useful if you want a clean, distraction-free desktop.
Frequently Asked Questions
Can I set a different wallpaper for each Space or virtual desktop?
No — Mac applies the same wallpaper to all Spaces. However, you can use a solid color or minimal image as your wallpaper and customize each Space with different app windows and layouts to create a distinct look for each one.
Why does my wallpaper look blurry or stretched?
This usually happens when the image resolution is much smaller than your screen. For best results, use a photo that's at least 1920 × 1080 pixels. If you're using an older or smaller image, Mac will stretch it to fit, which can make it look fuzzy. Try a different photo or resize your image to match your screen resolution.
How do I use a live photo as my wallpaper?
Live Photos aren't supported as wallpapers on Mac — only still images work. If you have a Live Photo you want to use, open it in Photos, right-click it, and select Export to save it as a regular photo file, then use that file as your wallpaper.
Will changing my wallpaper affect my files or apps?
No — your wallpaper is purely visual and has no effect on your files, apps, or system performance. You can change it as often as you like without any risk to your data or settings.
Can I schedule wallpaper changes automatically?
Mac doesn't have a built-in scheduler for wallpaper rotation, but dynamic wallpapers change automatically based on time of day. If you want to rotate through multiple static images, you would need a third-party app from the App Store designed for that purpose.