The fastest way to change your Mac background

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 prefer to use your own photos instead of Apple's built-in collection, you have those options too — they're in the same menu.

Key Takeaways

  • System Settings > Wallpaper is the only place you need to go; there is no separate app or preference pane.
  • You can set different backgrounds for your desktop and lock screen, or use the same image for both.
  • Dragging a photo directly from Finder into the wallpaper preview will set it as your background without uploading it anywhere.
  • If you use multiple desktops or Spaces, you can assign different backgrounds to each one.

Opening System Settings and finding Wallpaper

Click the Apple menu in the top-left corner of your screen, then select System Settings. On newer Macs running macOS Ventura or later, System Settings opens directly. On older versions running macOS Monterey or Big Sur, you'll see System Preferences instead — the steps are the same.

Once System Settings is open, look for Wallpaper in the left sidebar. Click it. You'll see a preview of your current desktop and lock screen backgrounds, with options to change either one.

Choosing from Apple's built-in wallpaper collection

When you click Wallpaper, the right side of the window shows categories: Dynamic, Light, Dark, and Collections. Click any category to see thumbnails of available images. Hover over an image to see a larger preview.

Click an image once to explore it to your desktop. If you want the same image on your lock screen, click the lock screen preview at the top and select the same image again. If you want different images on each, just pick a different one for the lock screen.

The built-in collection includes landscapes, abstract designs, and solid colors. You can also browse by color or theme — Dynamic wallpapers change throughout the day based on the time of day.

Using your own photos as a background

To use a photo from your computer, click the plus sign (+) at the bottom of the Wallpaper window. A file browser opens. Navigate to the folder where your photo is stored, select it, and click Open. The photo appears in your wallpaper options and is now set as your background.

You can also drag a photo directly from Finder into the wallpaper preview window. This is faster if the photo is already visible on your screen. The image will be set as your background without being moved or copied anywhere.

Photos work best as backgrounds when they're at least 1920 × 1200 pixels, though macOS will scale smaller images to fit. Very small images may look blurry when stretched across your screen.

Setting different backgrounds for different Spaces

If you use multiple Spaces (separate virtual desktops), you can assign a different background to each one. Open Mission Control by swiping up with four fingers on your trackpad, or press Control + Up Arrow. You'll see all your Spaces at the top of the screen.

Right-click on a Space and select Wallpaper. This opens the wallpaper settings for that specific Space only. Choose a background, and it will appear only when you're using that Space. Switch to another Space and repeat the process to give it its own background.

Troubleshooting background changes that don't stick

If you change your background but it reverts to the previous one after restart, check whether a screen saver is overriding it. Open System Settings, click Screen Saver, and make sure it's set to None or a screen saver you actually want. Screen savers can interfere with wallpaper display on some Macs.

If you're using a photo you uploaded and it's no longer on your computer, macOS may revert to a default background. Keep your photo files in a permanent location — moving or deleting them after setting them as a background can cause this issue.

On very old Macs running macOS Sierra or earlier, the Wallpaper option is in System Preferences under Desktop & Screen Saver, not System Settings. The process is the same, but the menu location is different.

Frequently Asked Questions

Can I set a different background for my lock screen than my desktop?

Yes. In the Wallpaper window, you'll see two preview boxes at the top — one for your desktop and one for your lock screen. Click the lock screen preview and select a different image. They can be completely different, or the same.

What file types work as Mac backgrounds?

JPEG, PNG, HEIF, and TIFF files all work. Most photos from your camera or phone are already in one of these formats. If you have a file in a different format, you can convert it using Preview or a free online converter before setting it as your background.

Will changing my background affect my Mac's performance?

No. A static image uses almost no processing power. Dynamic wallpapers use slightly more resources because they update throughout the day, but the difference is negligible on modern Macs. You won't notice any slowdown.

Can I schedule my background to change automatically?

macOS doesn't have a built-in scheduler for rotating through multiple backgrounds on a timer. However, Dynamic wallpapers change automatically based on the time of day. If you want to rotate through custom photos, you'll need a third-party app from the Mac App Store.

Why does my background look pixelated or blurry?

Your image is probably smaller than your screen resolution. A 1920 × 1200 image is the minimum for a sharp appearance on most modern displays. If your photo is smaller, it will be stretched and may look fuzzy. Use a higher-resolution version if you have one.