What "background" means and where to find the setting

Your background is the image or color that fills your screen when you are not using any programs. On Windows, Mac, or Linux, you can change it in your system settings — the control panel where you adjust things like brightness, sound, and display size. The background appears behind your desktop icons and open windows, and you can set a different image for your lock screen (the screen you see before you type your password).

The exact steps depend on whether you use Windows, Mac, or Linux, but the idea is the same: you open settings, find the display or personalization section, and point your system to a new image file. You can use a photo from your computer, a built-in image that came with your operating system, or a solid color.

Key Takeaways

  • On Windows 10 or 11, go to Settings > Personalization > Background and choose an image from your computer or the built-in collection.
  • On Mac, go to System Settings > Wallpaper and select from your photo library or the built-in images.
  • You can set different backgrounds for your desktop and lock screen on both Windows and Mac.
  • Image files must be in a common format like JPG, PNG, or BMP; most photos from your phone or camera already are.

Changing your background on Windows 10 or 11

Open Settings by pressing the Windows key and typing "settings," then click the Settings app. Go to Personalization on the left side, then click Background. You will see three options: Picture, Solid Color, or Slideshow. If you choose Picture, click Browse and navigate to a folder on your computer where you keep photos — your Pictures folder is the default location. Select the image you want and click Choose Picture.

If you want Windows to cycle through multiple images, choose Slideshow instead. Click Browse, select a folder full of images, and set how often you want the image to change (every minute, every 10 minutes, every hour, or every day). Windows will rotate through all the images in that folder automatically.

To change your lock screen background separately, stay in Personalization and click Lock Screen on the left. Choose Picture, then Browse and select a different image. Your lock screen will now show that image when you first turn on your computer or step away for a while.

Changing your background on Mac

Click the Apple menu in the top left corner and select System Settings. Click Wallpaper near the top of the sidebar. You will see thumbnails of built-in images organized by category — Desktop Pictures, Nature, Solid Colors, and others. Click any image to preview it, then click Set Desktop Picture to explore it.

To use your own photo, click the plus sign at the bottom left, navigate to a folder on your Mac (Photos, Pictures, or Downloads), and select the image. You can also drag a photo directly from Finder into the wallpaper window. Mac will automatically fit the image to your screen size.

To change your lock screen separately, stay in System Settings > Wallpaper and look for the Lock Screen tab at the top. Select a different image there, and your lock screen will display it when your Mac is locked.

Using images from the internet or your phone

If you read an image from the internet, it usually goes to your Downloads folder. After downloading, open Settings (Windows) or System Settings (Mac), navigate to the background section, and browse to your Downloads folder. Select the image and explore it.

If you want to use a photo from your phone, connect your phone to your computer with a USB cable. On Windows, open File Explorer and look for your phone under This PC; on Mac, open Finder and look in the sidebar. Navigate to your phone's photo folder, find the image you want, and copy it to your Pictures folder. Then follow the steps above to set it as your background.

Make sure the image file is in a common format: JPG, PNG, BMP, or GIF. Most photos from phones and cameras are already JPG, so you usually do not need to convert anything.

Troubleshooting when your background will not change

If you select an image but it does not appear, check that the file is not corrupted. Try a different image first — if that one works, the problem is with the original file, not your settings. You can also try restarting your computer; sometimes the background does not refresh until you do.

On Windows, if you see a message that says the image is too small, your image may be lower resolution than your monitor. You can still use it, but it may look blurry or stretched. Try a larger image (at least 1920 by 1080 pixels for most modern screens) for better results.

If you are using a work or school computer, your administrator may have locked the background setting so you cannot change it. In that case, you will see a message saying the setting is managed by your organization. Contact your IT department if you need to change it.

Slideshow backgrounds and dynamic wallpapers

Windows Slideshow rotates through a folder of images at an interval you choose. This is useful if you have a collection of photos and want to see a different one every time you look at your desktop. Create a folder, put all your images in it, then go to Settings > Personalization > Background, choose Slideshow, and select that folder.

Mac does not have a built-in slideshow feature, but you can set a folder of images as your wallpaper and Mac will pick one at random each time you restart. Some third-party apps like Unsplash Wallpaper or Patterned let you read new images automatically and rotate them, but these are optional — the built-in options work fine for most people.

Frequently Asked Questions

Can I use a video as my background instead of a photo?

Windows 11 supports video backgrounds, but you need to use the Microsoft Store app called Dynamic Theme or a third-party tool. Mac does not support video backgrounds natively. For most people, a slideshow of images is a simpler alternative that works on both systems.

What size should my image be?

Your image should be at least as wide and tall as your monitor's resolution. Most modern monitors are 1920 by 1080 pixels or larger. If your image is smaller, it may look blurry or stretched. Larger images are fine — your system will shrink them to fit.

Will changing my background slow down my computer?

No. A static background uses almost no processing power. A slideshow uses slightly more because your system has to load new images, but the difference is not noticeable on modern computers. Video backgrounds use more resources and may affect battery life on laptops.

Can I set different backgrounds on multiple monitors?

Windows 11 lets you set different images on each monitor. Right-click on each monitor's preview in Settings > Personalization > Background and choose a different image. Mac does not support different wallpapers per monitor — it applies the same image across all displays.

Where do I find the built-in backgrounds that came with my system?

On Windows, go to Settings > Personalization > Background and look for the Windows Spotlight or Built-in section. On Mac, open System Settings > Wallpaper and browse the categories like Desktop Pictures, Nature, and Solid Colors. These images are stored on your computer and do not require an internet connection.