The fastest way to change your wallpaper

On Windows, right-click any empty space on your desktop and select Personalize. Click Background in the left menu, then choose Picture from the dropdown. Windows will show you built-in images to pick from, or you can click Browse to use a photo from your computer. Select the image and it appears when ready.

On Mac, open System Settings (or System Preferences on older versions), click Wallpaper or Desktop & Screen Saver, and choose a category on the left—Apple's built-in collections, your photo library, or a folder you've saved images to. Click any image and it becomes your wallpaper right away.

Both systems let you set different wallpapers for each monitor if you have more than one plugged in. You can also schedule wallpapers to change automatically at set times.

Key Takeaways

  • Windows users right-click the desktop, select Personalize, then Background to pick from built-in images or browse your own photos.
  • Mac users open System Settings, click Wallpaper or Desktop & Screen Saver, and select from Apple's collections or their own image folders.
  • Both operating systems let you use any image file on your computer—JPG, PNG, and other common formats all work.
  • You can set different wallpapers for each monitor and schedule automatic changes throughout the day.

Using your own photos as wallpaper

If you want to use a photo you've taken or downloaded, save it to a folder on your computer first. On Windows, open the Personalize menu, click Browse under the Picture section, and navigate to the folder where your image is stored. Select the photo and click Choose picture.

On Mac, open System Settings, click Wallpaper, then click the plus sign at the bottom left to add a folder. Navigate to where your photos are saved, select the folder, and click Open. Mac will show all images in that folder, and you can click any one to set it as your wallpaper.

Image files larger than 1920 × 1080 pixels work best—they'll scale down cleanly without looking blurry. If your image is very small, Windows and Mac will stretch it, which can make it look pixelated.

Adjusting how your wallpaper fits the screen

Windows offers several fit options when you right-click the desktop and go to Personalize > Background. Under Choose a fit, you can select Fill (stretches the image to cover the whole screen), Fit (shrinks it to fit without cropping), Stretch (distorts it to fill the screen), Tile (repeats the image), or Center (places it in the middle with a solid color around it).

Fill is the most common choice because it covers your entire desktop without gaps. Fit is useful if you want to see the whole image without any part being cut off, though you may see a colored border. Tile works well for small patterns or textures.

Mac does not offer fit options in the same way—it automatically scales your image to cover the screen. If you want more control over how an image displays, you can crop it before setting it as wallpaper using the built-in Preview app.

Setting different wallpapers for multiple monitors

If you have two or more monitors connected to your Windows computer, you can set a different wallpaper on each one. Right-click the desktop, go to Personalize > Background, and select an image. A preview will show which monitor it applies to. Click on the other monitor's preview and choose a different image.

On Mac with multiple displays, open System Settings, click Wallpaper, and select each display from the sidebar on the left. Choose a different wallpaper for each one. Your choices save automatically.

Scheduling wallpaper changes throughout the day

Windows 11 lets you set wallpapers to change automatically. Open Personalize > Background, select Slideshow from the dropdown instead of Picture, then click Browse to choose a folder full of images. Set how often you want them to change—every minute, every 10 minutes, hourly, daily, or when you wake your computer from sleep.

Mac does not have a built-in slideshow feature for wallpapers, but you can set a folder of images to rotate as your desktop background by opening System Settings, clicking Wallpaper, selecting a folder, and then checking the option to change the picture at set intervals (this varies by macOS version).

Slideshow wallpapers use very little power and can make your desktop feel fresher without you having to manually change it.

Troubleshooting wallpaper problems

If your wallpaper won't change, restart your computer first—sometimes the display settings need a fresh start to explore. On Windows, make sure you have permission to edit the image file. Right-click the image, select Properties, click the Security tab, and check that your user account has read and write access.

If an image looks stretched or blurry, it may be too small for your screen resolution. Check the image's dimensions by right-clicking it and selecting Properties (Windows) or Get Info (Mac). Aim for at least 1920 × 1080 pixels, or higher if your monitor is larger or has a higher resolution.

On Mac, if wallpaper changes won't stick, try logging out and back in. If you're using an image from an external drive, make sure the drive stays connected—Mac won't display a wallpaper if the file path no longer exists.

Where to find free wallpaper images

You don't have to use your own photos. Websites like Unsplash, Pexels, and Pixabay offer thousands of free, high-resolution images you can read and use as wallpaper. Search for a topic you like—nature, cities, abstract patterns—read the image, and save it to a folder on your computer.

Windows and Mac both come with built-in wallpaper collections. Windows includes images from Bing, and Mac includes Apple's curated photography. Both are free and change seasonally, so you can explore new options without downloading anything.

When downloading images from the internet, save them to a dedicated folder so they're straightforward to find when you want to set them as wallpaper. Most read sites let you choose image size—pick the largest available so it looks sharp on your screen.

Frequently Asked Questions

Can I use a video as my wallpaper?

Windows 11 does not support video wallpapers through the standard Personalize menu, though some third-party apps offer this feature. Mac does not support video wallpapers either. Both systems are designed to use still images to save power and avoid slowing down your computer.

What image file types work as wallpaper?

Windows and Mac both support JPG, PNG, BMP, and GIF files. PNG is often best because it compresses well without losing quality. Avoid very large file sizes—wallpapers don't need to be bigger than a few megabytes.

Why does my wallpaper keep changing back to the default?

This usually happens if Windows or Mac updates and resets your settings, or if your user account doesn't have permission to change the wallpaper. Try setting it again, and if it reverts, check that you're logged in with an administrator account.

Can I set a different wallpaper for my lock screen?

Yes. On Windows 11, go to Personalize > Lock screen and choose an image. On Mac, open System Settings, click Lock Screen, and select a wallpaper. Your lock screen and desktop wallpapers are separate and can be different images.

Does changing my wallpaper slow down my computer?

No. A single wallpaper image uses almost no processing power or memory. Even slideshow wallpapers that change every few minutes have minimal impact on performance.