The fastest way to change your background

On Windows, right-click any empty space on your desktop and select Personalize. Click Background in the left menu, then choose Picture, Solid color, or Slideshow from the dropdown. Pick what you want and Windows applies it when ready.

On Mac, open System Settings (or System Preferences on older versions), click Wallpaper or Desktop & Screen Saver, select a category on the left, and click the image you want. It takes effect right away.

Both methods take under a minute. If you want to use your own photo instead of a built-in image, the process is almost identical — you just point the system to a folder where your image lives.

Key Takeaways

  • Windows: right-click the desktop, select Personalize, click Background, and choose Picture, Solid color, or Slideshow.
  • Mac: open System Settings, click Wallpaper or Desktop & Screen Saver, and select an image from the categories shown.
  • To use your own photo, browse to it during the same process instead of picking a built-in image.
  • Slideshow mode rotates through multiple images at intervals you set, and works on both Windows and Mac.

Using your own photos as the background

Both Windows and Mac let you pick any image file from your computer. The image should be at least 1024 × 768 pixels to avoid looking stretched or blurry, though larger is better — most modern monitors are 1920 × 1080 or wider.

On Windows, open Personalize, click Background, select Picture from the dropdown, then click Browse. Navigate to the folder where your photo lives and select it. Windows shows you a preview before you confirm.

On Mac, open System Settings, click Wallpaper, then click the + button at the bottom. Navigate to your photo and select it. Mac also shows a preview so you can see how it will look.

If you have a folder of photos you like, you can set Windows or Mac to rotate through them. On Windows, choose Slideshow instead of Picture and pick the folder. On Mac, select a folder and check the box for Change picture — you can set it to change every 5 minutes, every hour, or every day.

Adjusting how the image fits your screen

Windows offers several ways to position your image. In the Personalize menu under Background, look for the Choose a fit dropdown. The most common options are Fill (stretches the image to cover the whole screen), Fit (shrinks it so the whole image shows without stretching), and Tile (repeats a small image across the screen).

Fill is usually the best choice because it covers the entire background without gaps. Fit is useful if you want to see the entire image and don't mind empty space around it. Tile is rarely needed unless you specifically want a pattern effect.

Mac does not offer as many positioning options — it automatically scales your image to fit the screen. If the image is smaller than your screen, Mac will stretch it slightly. If it is larger, Mac will crop it to fit.

Changing the background on a second monitor

If you have two monitors connected, Windows treats them as one extended display by default, so the same background spans across both. If you want different backgrounds on each monitor, you will need a third-party tool — Windows does not have a built-in way to do this.

On Mac, the background applies to all connected monitors the same way. Mac also does not have a native option to set different backgrounds per monitor, though some third-party apps exist if you need this feature.

For most people, one background across all monitors is fine. If you need different images on each screen, search your system's app store for "dual monitor wallpaper" to see what tools are available.

Troubleshooting a background that won't change

If you change the background but it reverts or does not appear, the most common cause is that a screensaver or lock screen setting is overriding it. On Windows, open Settings, go to Personalize, click Lock screen, and make sure Screensaver is set to None. Then go back to Background and try again.

On Mac, open System Settings, click General, then Login Items, and check whether any app is set to open at startup that might be changing your background. Some security software or third-party apps can override your choice.

If the image file itself is corrupted or in an unsupported format, the system may refuse it silently. Try a different image to test. Windows and Mac both support JPG, PNG, and BMP files — these are the safest formats to use.

Using a solid color or gradient instead of an image

You do not have to use a photo. On Windows, open Personalize, click Background, and select Solid color from the dropdown. Click the color box to open a palette, or enter a hex color code if you know one. Windows applies it when ready.

You can also choose Gradient to blend two colors together. Pick your colors and Windows shows you a preview of how they blend.

On Mac, solid colors are available in the Wallpaper menu under the Colors category. Click any color swatch to explore it. Mac does not have a gradient option built in, but you can create a gradient image in a photo editor and use it as your background instead.

Frequently Asked Questions

Can I set a different background for each user account on my computer?

Yes. Each user account has its own background setting. When you log in as a different user, Windows or Mac remembers that user's choice. Change the background while logged in as one user, and it only affects that account.

What image size works best for a background?

Match your monitor's resolution or larger. For a 1920 × 1080 monitor, use an image at least that size. For 4K (3840 × 2160), use 4K images. Smaller images will look blurry or pixelated when stretched. Most photos from modern phones or cameras are large enough.

Why does my background look blurry or stretched?

The image is smaller than your screen resolution. Use the Fit option instead of Fill to avoid stretching, or find a larger version of the image. On Mac, you cannot avoid stretching if the image is too small — use a larger file instead.

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

Windows and Mac do not support video backgrounds natively. You can use a third-party app to simulate this, but it uses more power and can slow your computer. For most users, a slideshow of images is a better choice.

How do I remove the background and go back to the default?

On Windows, open Personalize, click Background, and select one of the default images that came with your system. On Mac, open Wallpaper and pick one of the built-in options. Both systems always have a default background you can return to.