You can create wallpaper from your own photos or designs using free tools on your computer or phone

Making wallpaper means taking an image — a photo you took, a design you made, or artwork you found — and sizing it to fit your screen perfectly. Your computer or phone then displays that image as your background. You do not need special software or design experience. Most people use either a photo editing tool they already have (like Preview on Mac or Photos on Windows) or a free online editor like Canva or Pixlr.

The main step is getting the dimensions right. A wallpaper that is the wrong size will either stretch, shrink, or leave blank space around the edges. Once you know your screen size, you resize your image to match, then save it in the right place on your device. The whole process takes five to fifteen minutes.

Key Takeaways

  • You need to know your screen resolution (the width and height in pixels) before you resize anything, because wallpaper that does not match your screen size will look stretched or leave blank space.
  • Free tools like Canva, Pixlr, or your device's built-in photo editor can resize and crop images to the exact dimensions you need.
  • Once your image is the right size, you save it to your Pictures folder, then set it as your wallpaper through your device's display settings.
  • Common mistakes include using an image that is too small (which makes it blurry when enlarged) or not accounting for icons and taskbars that cover part of the screen.

Find out what screen size you need

Before you resize anything, you need to know your screen's resolution. This is measured in pixels — for example, 1920 by 1080 or 2560 by 1440. The first number is width, the second is height. If your wallpaper does not match these exact dimensions, it will either stretch awkwardly or leave colored bars on the sides.

On Windows, right-click your desktop and select "Display settings." Scroll down to "Display resolution" and you will see two numbers listed. Write them down. On Mac, click the Apple menu, go to "System Settings," then "Displays," and look for "Resolution." On an iPhone, your resolution is 1170 by 2532 (for most recent models). On Android, go to Settings, then About Phone, and look for "Screen resolution" — this varies by phone model.

If you are not sure which number is which, the larger number is almost always the width on a computer monitor, and the smaller is the height. For phones, the taller number is the height because phones are vertical.

Choose an image and check its size

Start with an image that is already large. A photo from your phone camera, a screenshot, or artwork you downloaded should work. The image needs to be at least as wide and tall as your screen resolution, or it will look blurry when you enlarge it to fit. If you are not sure, open the image on your computer, right-click it, and select "Properties" (Windows) or "Get Info" (Mac). Look for "Dimensions" — this tells you the width and height in pixels.

If your image is smaller than your screen resolution, you have two choices: use a different image, or accept that it will look slightly soft when enlarged. Most people choose a different image. If you are making wallpaper from a small image on purpose — like a logo or icon — you can add a solid color or gradient background behind it instead of stretching it.

Resize your image using a free tool

The easiest free option is Canva. Go to canva.com, click "Create a design," and search for "Custom size." Enter your screen resolution (width first, then height), and Canva will create a blank canvas at exactly that size. Upload your image, resize it to fill the space the way you want, and download it as a PNG or JPG file.

If you prefer to work on your computer without opening a browser, use Preview on Mac or the built-in Photos app on Windows. On Mac, open your image in Preview, click "Tools," then "Adjust Size." Change the width and height to match your resolution, make sure "Resample image" is checked, and click OK. On Windows, open Photos, click "Edit & Create," then "Crop & rotate," and manually adjust the size — though this is less precise than Canva.

Another free option is Pixlr (pixlr.com). Upload your image, go to "Image" in the menu, select "Image Size," and enter your resolution. Pixlr will resize your image and let you crop it if needed. All three tools let you download the finished wallpaper to your computer.

Crop your image if it does not fit perfectly

If your image is a different shape than your screen — for example, a square photo on a wide monitor — you will need to crop it. Cropping means cutting off the sides or top and bottom so the remaining image matches your screen's width-to-height ratio.

In Canva, upload your image, and it will automatically show you how much space it fills. Drag the edges of the image inward to crop it, or use the crop tool to select which part you want to keep. In Preview on Mac, click "Tools," then "Crop," and drag the corners to select the part of the image you want. In Pixlr, use the crop tool on the left side of the screen to draw a rectangle around the part you want to keep.

A common mistake is cropping too much and losing important details. If your photo has people or objects in the center, make sure they stay visible after you crop. Take your time with this step — it is easier to get it right now than to redo it later.

Save your wallpaper and set it on your device

Once your image is resized and cropped, download it to your computer. Most tools will let you choose JPG or PNG format — either works fine for wallpaper. Save it to your Pictures folder or Desktop so you can find it easily.

On Windows, right-click the image file and select "Set as desktop background." Your wallpaper will change immediately. On Mac, open System Settings, go to "Wallpaper," click the plus sign, find your image, and click "Set Desktop Picture." On iPhone, open the image in Photos, tap "Share," select "Use as Wallpaper," choose whether you want it on the lock screen or home screen, and tap "Set." On Android, open the image, tap the three dots, select "Set as wallpaper," and choose "Home screen," "Lock screen," or "Both."

If your wallpaper looks stretched or has blank space around it, go back to your resizing tool and check that the dimensions match your screen resolution exactly. A difference of even a few pixels can cause this problem.

Avoid common mistakes that make wallpaper look wrong

The most common mistake is using an image that is too small. If you enlarge a small image to fill your screen, it will look blurry or pixelated. Always start with an image that is at least as large as your screen resolution. If you are not sure, use a photo from your phone camera or a high-resolution image from a photo website.

The second mistake is forgetting about taskbars and icons. On Windows, the taskbar at the bottom covers part of your wallpaper. On Mac, the dock does the same. On phones, the status bar at the top and app icons at the bottom cover wallpaper. If you put important details at the very edge of your image, they will be hidden. Leave some empty or less important space around the edges.

The third mistake is not checking the dimensions before you resize. If you guess at your screen resolution, your wallpaper will not fit right. Always look up your exact resolution in your device settings first. The fourth mistake is saving in the wrong format — use JPG or PNG, not BMP or TIFF, because those formats take up much more space and can cause your computer to slow down.

Frequently Asked Questions

Can I use any photo as wallpaper?

Yes, but the photo needs to be large enough. If it is smaller than your screen resolution, it will look blurry when enlarged. Photos from your phone camera, downloaded images, or screenshots all work as long as they are at least 1920 by 1080 pixels (or whatever your screen resolution is).

What if my wallpaper looks stretched or has black bars on the sides?

This means the image dimensions do not match your screen resolution. Go back to your resizing tool, check your screen resolution again, and resize the image to match exactly. If you are not sure of your resolution, look it up in your device settings again — you may have written it down wrong the first time.

Do I need to buy software to make wallpaper?

No. Canva, Pixlr, Preview (Mac), and Photos (Windows) are all free. Your device's built-in tools are usually enough unless you want to add text, filters, or complex designs — in which case Canva is still free for basic use.

Can I make animated wallpaper?

On Windows and Mac, static images are standard, though some third-party tools allow video wallpaper. On iPhone and Android, you can use live photos or video files as wallpaper, but the process is different from static images and uses more battery power.

What resolution should I use if I have two monitors?

Check the resolution of each monitor separately in your display settings. You can either make one wallpaper that spans both screens (using the combined width of both monitors) or make two separate wallpapers, one for each monitor. Most people find it easier to make two separate images.