The fastest way to change your background depends on what device you're using

Changing your background — the image that appears behind your icons and windows — takes less than a minute on most devices. The steps differ between Windows, Mac, iPhone, and Android, but the principle is the same: you're telling your device which image file to display. You can use a photo you've taken, a picture from the internet, or one of the built-in images that came with your device.

The method you use also depends on whether you want to change the background on your main screen (called the desktop on computers, or the home screen on phones), or the lock screen that appears before you unlock your device. Most devices let you set these separately, so you can have different images for each.

Key Takeaways

  • On Windows, right-click the desktop and select "Personalize" to choose from built-in images or upload your own photo.
  • On Mac, open System Settings, go to Wallpaper, and drag a photo from your computer into the preview area.
  • On iPhone, open Settings, tap Wallpaper, and choose from Apple's built-in collection or a photo from your library.
  • On Android, long-press the home screen, tap Wallpapers, and select an image from your phone's gallery or the built-in options.
  • You can usually set different backgrounds for your main screen and lock screen on all devices.

Changing your background on Windows

Right-click anywhere on your desktop (the empty space where your icons sit) and select "Personalize" from the menu that appears. This opens the Settings window to the Personalization section.

On the left side, click "Background." You'll see a dropdown menu that says "Personalize your background" — click it and choose either "Picture," "Solid color," or "Slideshow." If you pick "Picture," Windows shows you a gallery of built-in images. Click any one to preview it, then click "Choose photo" to set it.

To use your own photo instead, click "Browse" at the bottom of the window, navigate to the folder where your photo is saved, and select it. Windows accepts JPG, PNG, and BMP files. The image will stretch or shrink to fit your screen, so very small photos may look blurry.

Changing your background on Mac

Click the Apple menu in the top-left corner and select "System Settings." In the sidebar on the left, click "Wallpaper." You'll see thumbnails of available images — click any one to preview it on your screen.

To use a photo from your computer, open Finder and locate the image file. Drag it directly into the preview area in System Settings. Mac will set it as your background immediately. You can also right-click a photo in Finder, select "Set Desktop Picture," and it will apply automatically.

If you want to set different images for your main screen and lock screen, click the dropdown at the top that says "Desktop" or "Lock Screen" and repeat the process for each one.

Changing your background on iPhone

Open the Settings app and scroll down to find "Wallpaper." Tap it, then tap "Add New Wallpaper." You'll see two options: "Featured" (Apple's built-in collection) or "Photos" (images you've taken or saved to your phone).

If you choose Featured, scroll through the available images and tap one to preview it. Tap "Add" at the bottom, then choose whether to set it as your lock screen, home screen, or both. If you choose Photos, select the album where your image is stored, tap the photo you want, and follow the same process.

You can set a different image for your lock screen and home screen. When you tap "Add," the phone will ask which screen you want to change. If you want both screens to match, select "Set Both" instead.

Changing your background on Android

Long-press (hold your finger on) an empty area of your home screen for about two seconds. A menu will appear at the bottom — tap "Wallpapers." You'll see options for built-in wallpapers, images from your gallery, or live wallpapers (animated backgrounds).

If you choose a built-in wallpaper, tap it to preview it, then tap "Apply" or "Set Wallpaper." If you want to use a photo from your phone, tap "Gallery," navigate to the folder where the photo is stored, select it, and tap "Apply."

Some Android phones let you set different backgrounds for your lock screen and home screen. If you see an option to choose which screen to change, select the one you want before tapping Apply. On other phones, the same image applies to both screens automatically.

Using photos from the internet as your background

If you find an image online that you want to use, save it to your device first. On Windows or Mac, right-click the image and select "Save image as," then choose where to save it. On iPhone or Android, long-press the image and select "Save image" or "Download image."

Once the image is saved, follow the steps above for your device. On Windows, use "Browse" to find the saved file. On Mac, drag it from Finder into System Settings. On iPhone, it will appear in your Photos app under the album where you saved it. On Android, it will be in your Gallery or Downloads folder.

Be aware that very large images (more than 10 MB) may slow down older phones or computers. If your device feels sluggish after changing your background, try using a smaller image instead.

What to do if your background won't change

If you've followed the steps but your background hasn't changed, restart your device. Power it off completely, wait 10 seconds, and turn it back on. This clears temporary files that may be preventing the change from taking effect.

If the background still hasn't changed, check that the image file isn't corrupted. Try using a different image to see if the problem is with that specific file. On Windows, make sure the image is in a format Windows recognizes (JPG, PNG, or BMP). On Mac, try dragging the image into System Settings again — sometimes the first attempt doesn't register.

If you're using a photo you took yourself and it won't work, the file may be too large or in an unsupported format. Try opening it in a photo editor, resizing it to match your screen resolution, and saving it as a JPG file before trying again.

Frequently Asked Questions

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

On Windows and Mac, no — the background must be a still image. On Android, you can use live wallpapers, which are animated and sometimes respond to touch. iPhone does not support animated home screen backgrounds, though you can set a video as your lock screen wallpaper on newer models.

Why does my background look stretched or blurry?

This usually happens when the image is much smaller than your screen resolution. A photo taken on an older phone or camera may be 1920 pixels wide, but your monitor might be 2560 pixels wide. The device stretches the small image to fill the larger screen, making it blurry. Use a larger image, or crop a larger photo to fit your screen better.

Can I set a different background for each workspace on Mac?

Yes. Open System Settings, click "Wallpaper," and at the top you'll see an option to choose which space or display you're customizing. Set a different image for each one, and Mac will switch backgrounds when you move between workspaces.

Will changing my background use more battery on my phone?

A still image will not. Live wallpapers and animated backgrounds on Android do use slightly more battery because they're constantly updating, but the difference is usually less than 1 percent per hour. If battery life is a concern, stick with a regular photo.

What happens to my background if I update my operating system?

Your background will stay the same. Operating system updates do not reset your personalization settings. If you're using a built-in image and the update removes it, your device will fall back to a default background, but any photo you uploaded will remain.