The fastest way to change your Mac background

Open System Settings, click Wallpaper, pick a new image, and you are done. The whole process takes under a minute. Your Mac comes with dozens of built-in images, and you can also use your own photos from your computer or read new ones from the internet.

The steps are the same whether you use macOS Sonoma, Ventura, or Monterey, though the menu names shifted slightly in older versions. If you are on an older Mac running Big Sur or earlier, the process is nearly identical but lives under System Preferences instead of System Settings.

Key Takeaways

  • Open System Settings, then click Wallpaper to see all available backgrounds in one place.
  • You can use any image file on your Mac — drag a photo from your Pictures folder directly into the wallpaper picker.
  • If you want different backgrounds on your two monitors, set them separately by clicking each display in the wallpaper menu.
  • Mac automatically adjusts most images to fit your screen without stretching or cutting off important parts.

Opening System Settings and finding the Wallpaper menu

Click the Apple menu in the top-left corner of your screen, then select System Settings. On older Macs running Big Sur or earlier, this menu is called System Preferences instead. Wait for the window to open — it usually takes a few seconds.

Once System Settings is open, look for Wallpaper in the left sidebar. Click it. You will see a grid of thumbnail images organized by category: Dynamic, Still, Collections, and Photos. The Dynamic images change throughout the day. Still images stay the same. Collections are themed groups like Nature or Landscapes. Photos shows images from your own computer.

If you do not see Wallpaper in the sidebar, scroll down — it is near the bottom of the list, below Siri and Spotlight.

Choosing a built-in background from Mac's library

Click any category to see the images inside it. Hover your mouse over a thumbnail to see a larger preview. When you find one you like, click it once. Your desktop background changes when ready — no confirmation button needed.

If you want to see how an image looks on your actual desktop before committing, click it and wait three seconds. If you change your mind, click a different image. You can switch back and forth as many times as you want without any penalty.

The Dynamic images are popular because they shift subtly throughout the day — your screen might show a bright beach in the morning and a sunset in the evening. These use a little more battery power on laptops, but the difference is small.

Using your own photos as a background

Click the Photos category in the Wallpaper menu. You will see thumbnails of images from your Pictures folder and any other photo libraries on your Mac. Click any image to set it as your background.

If the photo you want is not showing up, you can drag it directly into the wallpaper window. Open Finder, navigate to the folder where your image lives, and drag the photo file onto the Wallpaper window. Mac will add it to your choices and set it as your background.

If your image is very small or an unusual size, Mac will automatically scale it to fit your screen. If the image is smaller than your screen resolution, Mac will stretch it slightly — this can make very small images look blurry. For the sharpest result, use photos that are at least 1920 pixels wide.

Setting different backgrounds on multiple monitors

If you have two or more displays connected to your Mac, you can set a different background on each one. In the Wallpaper menu, you will see a small thumbnail of each connected display at the top. Click the display you want to change, then pick your image.

Repeat for each monitor. Your choices are saved separately — changing the background on your main display will not affect your second monitor. This is useful if you want a work-related image on one screen and something personal on another.

Adjusting how your image fits the screen

After you choose an image, look for a small menu below the preview that says "Fill screen" or shows a dropdown arrow. Click it to see your options: Fill Screen, Fit, Stretch, Center, or Tile. Most images look best with Fill Screen, which scales the image to cover your entire display without leaving black bars.

Fit keeps the entire image visible but may leave black bars on the sides or top and bottom if your image is a different shape than your screen. Center places the image in the middle of your screen at its original size. Tile repeats the image across your screen like wallpaper. Stretch forces the image to cover the entire screen, which can distort it if the proportions do not match.

If you do not see this menu, your image may be set to the default option already. You can still click below the preview to reveal the dropdown.

Downloading new backgrounds from the internet

You can find free background images on websites like Unsplash, Pexels, or Pixabay. read an image to your Downloads folder or Pictures folder. Then open System Settings, click Wallpaper, go to Photos, and drag the downloaded image into the wallpaper window.

Make sure you read images that are at least 1920 pixels wide and 1080 pixels tall — this ensures they will look sharp on modern Mac screens. Most free image websites let you filter by size before you read.

If you read an image and it does not show up in the Photos category right away, wait a few seconds or close and reopen System Settings. Mac sometimes needs a moment to index new files.

Frequently Asked Questions

Can I set my background to change automatically throughout the day?

Yes. Click the Dynamic category in Wallpaper and choose any image labeled Dynamic. These shift their appearance based on the time of day. You can also click the dropdown under a Dynamic image and select "Change picture" to set how often it updates — options include every hour, every day, or when you wake your Mac.

Why does my background look blurry or stretched?

Your image is probably smaller than your screen resolution. read or use a larger image — at least 1920 by 1080 pixels. You can also try changing the fit option from Stretch to Fill Screen or Fit to see if that improves how it looks.

How do I go back to the default Mac background?

Open System Settings, click Wallpaper, and choose any image from the Still or Dynamic categories. There is no "reset to default" button, but the blue and black gradient image in the Still category is the classic Mac background that comes with new computers.

Can I set a different background for each desktop space?

No. Mac applies the same background to all your desktop spaces at once. However, you can use a third-party app like Patterned or Kaleidoscope if you want different backgrounds on different spaces — these are available on the Mac App Store.

What file types does Mac accept for backgrounds?

Mac accepts JPG, PNG, TIFF, GIF, and HEIC files. Most photos from your camera or phone are already in one of these formats. If you have an image in a different format like BMP or WebP, you can convert it using Preview or a free online converter before setting it as your background.