What you're changing and where to find it

Your desktop image (also called wallpaper or background) is the picture that fills your screen behind all your open windows and icons. It's stored on your computer's hard drive, and changing it doesn't affect how your computer works — you're just telling the operating system to display a different image file in that background space.

The steps differ between Windows and Mac because each operating system stores this setting in a different place. Both let you use images already on your computer, or images built into the system itself. You don't need any special software or administrator permission.

Key Takeaways

  • On Windows, right-click the desktop itself (not a window), select "Personalize", then choose "Background" to pick a new image.
  • On Mac, open System Settings, go to "Wallpaper", and click the image you want to use as your background.
  • You can use any image file stored on your computer — JPG, PNG, and BMP files all work on both systems.
  • If you want to use your own photo, save it to a folder on your computer first, then point the background settings to that file.
  • Your choice saves automatically once you select it; you don't need to click a separate "Save" button.

Changing your background on Windows 10 and Windows 11

Start by clicking on an empty area of your desktop — somewhere with no windows open and no icons. Right-click that empty space. A small menu will appear with several options. Look for and click "Personalize".

Windows will open the Settings app and take you directly to the Personalization section. On the left side, you'll see a menu with options like "Background", "Colors", and "Fonts". Click "Background".

You'll now see a row of thumbnail images at the top — these are the built-in backgrounds Windows offers. Click any one to preview it on your desktop. If you like it, that's your new background. If you want to use a photo you took yourself or downloaded, look for a button or dropdown that says "Browse" or "Choose a photo". Click it, navigate to the folder where your image is saved, select the file, and click "Choose this image".

Once you've selected an image, close the Settings window. Your new background is now active and will stay that way until you change it again.

Changing your background on Mac

Click the Apple menu in the top-left corner of your screen. From the dropdown, select "System Settings" (on newer Macs) or "System Preferences" (on older ones). The Settings window will open.

Look for "Wallpaper" in the left sidebar and click it. You'll see a grid of categories — "Collections" shows built-in images organized by theme, "Recent" shows images you've used before, and "Folders" lets you pick from images stored in specific places on your computer. Click any category to see the images inside.

Click the image you want to use. It will appear on your desktop when ready. You can also drag and drop an image file directly from Finder onto the wallpaper preview to use it. Close the Settings window when you're done — your choice is saved automatically.

Using your own photos as a background

If you want to use a photo you took or downloaded from the internet, you need to save it to your computer first. On Windows, create a folder called "My Backgrounds" in your Documents folder and save your image files there. On Mac, you can save them anywhere, but the Pictures folder is the easiest to find later.

Once your image is saved, follow the steps above for your operating system. When you reach the "Browse" or "Folders" step, navigate to the folder where you saved your photo, select it, and confirm. The image will now be your desktop background.

If your photo is very large (several thousand pixels wide), your computer might slow down slightly when displaying it. If you notice this, you can resize the image using a free tool like Paint (Windows) or Preview (Mac) before setting it as your background. Most people don't need to worry about this — modern computers handle large images fine.

What to do if your image looks stretched or cut off

When you set a background image, your operating system has to fit it to your screen size. If your image is smaller than your screen, Windows and Mac will stretch it, which can make it look blurry. If your image is larger, the system will crop it (cut off the edges).

On Windows, you can control this behavior. In the Personalization > Background settings, look for a dropdown labeled "Choose a fit" or similar. Your options usually include "Fill" (stretches to cover the whole screen), "Fit" (shrinks to fit without cropping), "Tile" (repeats the image), and "Center" (places the image in the middle without stretching). Try each one to see which looks best with your image.

On Mac, the system automatically crops or fits your image depending on its size. You don't have direct control over this, but the system usually makes a reasonable choice. If the result doesn't look right, try a different image or resize your photo before setting it as the background.

Reverting to a default background

If you want to go back to one of the built-in backgrounds, follow the same steps you used to change it in the first place. On Windows, open Personalize > Background and click one of the thumbnail images at the top. On Mac, open System Settings > Wallpaper and click a built-in image from the Collections.

You can also delete a custom background image from your computer without affecting your current desktop — the background will stay visible until you change it to something else. The image file and the background setting are separate things.

Troubleshooting common problems

If you right-click your desktop and don't see "Personalize", you may be right-clicking on a window instead of empty desktop space. Close all open windows first, then try again on the bare desktop.

If your image file doesn't appear in the browse window, make sure it's saved in a location your operating system can access — your Documents, Pictures, or Downloads folder are all fine. Some image formats (like TIFF or WebP) may not work; stick with JPG, PNG, or BMP files.

On Mac, if System Settings doesn't show a Wallpaper option, you may be running an older version of macOS. Try right-clicking the desktop itself and looking for "Change Desktop Background" in the menu instead.

Frequently Asked Questions

Can I set a different background for each monitor if I have multiple screens?

On Windows 11, yes — right-click each monitor's desktop separately and set a different background for each one. On Windows 10 and Mac, the background spans across all monitors as one image, so you can't set different images per screen without third-party software.

Will changing my background slow down my computer?

No. Your background image is stored on your hard drive and displayed by your graphics card, which is designed to handle this task. Changing it has no effect on your computer's speed or performance.

What image file types work as backgrounds?

JPG, PNG, and BMP files work on both Windows and Mac. GIF files work on Windows but not always on Mac. Avoid TIFF, WebP, and other uncommon formats — they may not be recognized by the background settings.

Can I schedule my background to change automatically at certain times?

On Windows, yes — in Personalize > Background, you can select a folder of images and set them to change every 30 minutes, hourly, daily, or weekly. On Mac, this feature is not built in, but you can use third-party apps from the App Store to do it.

If I delete an image file from my computer, what happens to my background?

If you delete the image file itself, your background will disappear and revert to a solid color or default image. The background setting points to the file location, so if the file is gone, there's nothing to display. Keep a copy of any image you want to use long-term.