What a wallpaper is and where to find it

A wallpaper is the background image that appears on your desktop — the screen you see when you close all your open windows. It can be a photograph, a solid color, a pattern, or any image file stored on your computer or downloaded from the internet.

You can use images already on your computer, read free wallpapers from websites like Unsplash, Pexels, or Pixabay, or use images from your own photo library. Most operating systems also come with built-in wallpaper options you can choose from without downloading anything.

Before you set a wallpaper, make sure you have the image file saved somewhere you can find it — usually your Downloads folder, Pictures folder, or Desktop. The image should be in a common format like JPG, PNG, or BMP.

Key Takeaways

  • On Windows, right-click your desktop, select "Personalize," then "Background" to choose or upload a wallpaper image.
  • On Mac, go to System Settings, click "Wallpaper," and drag an image into the preview area or choose from built-in options.
  • Your wallpaper image should be at least as wide and tall as your monitor's resolution for the best appearance without stretching.
  • You can set different wallpapers for each monitor if you use multiple displays.
  • Most operating systems let you set a wallpaper to change automatically on a schedule you choose.

Setting a wallpaper on Windows 10 and Windows 11

Right-click anywhere on your desktop (the empty space, not on an icon or window) and select "Personalize" from the menu that appears. This opens the Settings window to the personalization section.

Click "Background" in the left sidebar. You will see three options: "Picture," "Solid color," or "Slideshow." If you want to use an image file, select "Picture." Windows will show you thumbnails of wallpapers already on your computer. Click any thumbnail to preview it, and it becomes your wallpaper when ready.

To use your own image, scroll down to "Recent" or click "Browse" to navigate to the folder where your image is saved. Select the image and it will be set as your wallpaper. If the image is smaller than your screen resolution, you can choose how it displays: "Fill" stretches it to cover the screen, "Fit" shrinks it to show the whole image, "Stretch" distorts it to fill the screen, or "Tile" repeats it across the screen.

Setting a wallpaper on Mac

Click the Apple menu in the top-left corner and select "System Settings." In the sidebar, click "Wallpaper." You will see thumbnails of built-in wallpapers organized by category — Dynamic, Light, Dark, and Collections.

Click any thumbnail to preview it on your screen. If you like it, click "Set Desktop Picture" at the bottom. To use your own image instead, drag the image file directly into the preview area, or click the "+" button at the bottom left and navigate to your image file. Once you select it, click "Set Desktop Picture."

If you have multiple monitors connected to your Mac, you can set different wallpapers for each one. Click the monitor icon at the top of the Wallpaper settings to switch between displays.

Choosing an image size that fits your screen

Your wallpaper will look sharpest if the image is at least as wide and tall as your monitor's resolution. You can find your monitor's resolution by going to Display Settings on Windows or System Settings on Mac and looking for "Resolution" or "Display."

Common resolutions are 1920×1080 (Full HD), 2560×1440 (2K), or 3840×2160 (4K). If your image is smaller than your screen, it will either stretch (and look blurry) or tile (repeat across the screen). If it is larger, your operating system will shrink it to fit, which is fine — no quality is lost.

When downloading wallpapers from websites, look for versions that match or exceed your resolution. Most sites let you filter by resolution before downloading.

Setting up automatic wallpaper changes

On Windows, open Personalize settings and click "Background." Select "Slideshow" instead of "Picture." Click "Browse" to choose a folder containing multiple images. Set how often you want the wallpaper to change — options range from every minute to every day. Windows will cycle through the images in that folder on your schedule.

On Mac, open Wallpaper settings and select a collection (like "Aerial" or "Floating Shapes"). Check the box next to "Change picture" and choose your interval from the dropdown menu — options include every 30 seconds, every hour, every day, or when logging in.

Using wallpapers with multiple monitors

If you have two or more monitors connected to your computer, you can set the same wallpaper across all of them or use different images for each display.

On Windows, right-click your desktop and select "Personalize" > "Background." Choose your image, then scroll down to "Choose a fit." Select "Span" to stretch one image across all monitors, or "Fill" to show the same image on each monitor separately. If you want different wallpapers on each monitor, you will need to use a third-party tool — Windows Settings does not offer this directly.

On Mac, click the monitor icon in Wallpaper settings to switch between each connected display. Set a different wallpaper for each one by selecting it and clicking "Set Desktop Picture."

Troubleshooting common wallpaper problems

If your wallpaper does not appear after you set it, restart your computer. Sometimes the desktop needs to refresh to display the change. If a wallpaper looks stretched or distorted, check the image dimensions — it may be too small for your screen resolution. Try a different "fit" option (Stretch, Fill, Fit, or Tile on Windows) to see if another setting looks better.

If you cannot find the Personalize option on Windows, make sure you are right-clicking on empty desktop space, not on a window or icon. On Mac, if Wallpaper does not appear in System Settings, check that you are using macOS Ventura or newer — older versions use a different menu path (Apple menu > System Preferences > Desktop & Screen Saver).

If your wallpaper reverts to the default after restart, the image file may have been moved or deleted. Set the wallpaper again using an image in a permanent location, like your Pictures folder rather than Downloads.

Frequently Asked Questions

Can I use a video as my wallpaper?

Windows and Mac do not support video wallpapers natively through their standard settings. However, third-party tools like Wallpaper Engine (Windows) or Patterned (Mac) allow you to set animated or video wallpapers. These tools run in the background and use more system resources than static images.

What image format works best for wallpapers?

JPG, PNG, and BMP all work fine. JPG files are smaller and load faster. PNG supports transparency and is better for images with text or sharp edges. BMP is less common but still supported. Avoid formats like GIF or TIFF unless your operating system specifically supports them.

Will changing my wallpaper slow down my computer?

No. A static wallpaper uses almost no system resources. Animated wallpapers or slideshow features that change frequently use slightly more memory and battery power, but the impact is minimal on modern computers.

How do I remove a wallpaper and go back to the default?

On Windows, open Personalize > Background and select "Solid color," then choose a color. On Mac, open Wallpaper settings and select one of the built-in options like "Blue," "Green," or "Black." Both operating systems will revert to a plain background.

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

Yes. Each user account has its own wallpaper setting. Log into a different account, open Personalize or Wallpaper settings, and set a wallpaper for that account. The wallpaper will only appear when that user is logged in.