How to set a wallpaper on a Mac in 2026
A clear walkthrough for applying a downloaded 4K, 5K, or 6K still in System Settings, including a different image on each display.
A still wallpaper on a Mac is just an image file. You do not need a dedicated app to apply a 4K, 5K, 6K, or 16:10 download from a gallery like MacWallSpace.
Download a file that matches the panel
Retina displays have a native pixel size that is larger than the “points” shown in marketing copy. A 27-inch Studio Display, for example, is 5120×2880. If you feed it a 1920×1080 photo, macOS will upscale it and the desktop will look soft.
On each wallpaper page here, four stills are waiting: 3840×2160, 5120×2880, 6144×3456, and a 3456×2234 crop for 16:10 MacBook panels. Choose the size at or slightly above your display, then let the system scale down if needed. The size guide maps common Apple screens to those files.
Apply it in System Settings
- Open System Settings → Wallpaper.
- Drag the downloaded WebP onto the preview, or use the control that adds a folder or photo (the label shifts slightly between macOS versions).
- Confirm the desktop updated. If you also want the same still on the lock screen, check the lock-screen options on your version; some releases keep those settings on a separate pane.
You can Control-click the desktop and choose Change Wallpaper when that shortcut is present.
Two displays, two files
Select each display at the top of the Wallpaper pane and assign a file independently. A 16-inch MacBook and a Studio Display will want different pixel sizes, even if you keep the same scene. Using the 16:10 crop on the laptop and a 5K file on the studio panel avoids extra letterboxing.
When you want motion instead
A looping MP4 is not something macOS will officially set as the desktop wallpaper. If you downloaded a live loop, read the free-methods guide before installing any third-party utility.