The quickest way to change your lock screen picture on a Mac

You cannot change the lock screen picture directly from the lock screen itself. Instead, you open System Settings, go to Lock Screen, and choose a new image from Apple's built-in collection or upload your own photo. The change takes effect the next time you lock your Mac or restart.

The process takes about two minutes and requires no special software or permissions beyond access to your own Mac account.

Key Takeaways

  • Lock screen pictures are set through System Settings, not from the lock screen itself.
  • You can use Apple's pre-installed images, photos from your library, or any image file saved on your Mac.
  • Changes appear when ready the next time you lock your screen or restart your computer.
  • Your lock screen picture is separate from your desktop background — changing one does not affect the other.
  • If you share your Mac with other users, each account has its own lock screen picture.

Opening System Settings and finding the Lock Screen section

Click the Apple menu in the top-left corner of your screen and select System Settings. (On older Macs running macOS Monterey or earlier, this was called System Preferences.) The Settings window opens.

In the sidebar on the left, scroll down and click Lock Screen. You will see a preview of your current lock screen at the top, with options below it to change the image.

Choosing from Apple's built-in images

Under the preview, you will see a row of image categories: Dynamic, Still, Screensavers, and others depending on your macOS version. Click any category to see the images available in that group.

Click the image you want to use. It appears in the preview when ready. The change is saved automatically — you do not need to click a separate "explore" or "Save" button.

Dynamic images change throughout the day. Still images stay the same. Screensavers use the same images as your Mac's screensaver collection. Try each category to see which style you prefer.

Using your own photos as the lock screen picture

To use a photo from your Mac instead of an Apple image, click the + button at the bottom of the image preview, or look for an option labeled Add or Choose Photo (the exact label varies by macOS version).

A file browser opens. Navigate to the folder containing your photo — usually Pictures or Downloads — and click the photo you want. Click Open or Choose. The photo appears in the preview and becomes your lock screen image.

Your photo must be in a standard image format: JPG, PNG, HEIF, or TIFF. If you have a photo in a different format, you can open it in Preview, go to File > Export, and save it as JPG or PNG before using it as your lock screen picture.

Adjusting the image position and focus

After you choose a photo, you may see options to adjust how it appears on the lock screen. Some versions of macOS let you move the image or change its zoom level by dragging or using a slider.

If your photo has a subject you want to keep visible — a face, an animal, or an object — drag the image in the preview to position it so the important part stays clear of the clock and notifications that appear on top of it.

Understanding the difference between lock screen and desktop background

Your lock screen picture and your desktop background are separate. Changing one does not change the other. The lock screen is what you see when your Mac is locked or when you first wake it. The desktop background is what appears behind your open windows when you are using your Mac.

If you want both to match, you will need to set them separately. To change your desktop background, go to System Settings > Wallpaper and follow the same process.

What happens if you share your Mac with other users

Each user account on a shared Mac has its own lock screen picture. When you change the lock screen in your account, it does not affect other users' lock screens. Each person can set their own image through their own System Settings.

If someone else's lock screen appears when you lock the Mac, it means a different user account locked it last. Your lock screen picture will appear when you log back in to your own account.

Frequently Asked Questions

Can I use a video or animated GIF as my lock screen picture?

No. Lock screen images must be static photos in JPG, PNG, HEIF, or TIFF format. You can use Apple's Dynamic images, which change throughout the day, but you cannot upload your own video or animated file.

Why does my photo look blurry or zoomed in on the lock screen?

Your Mac may be cropping or scaling the image to fit the screen size. Try adjusting the image position in the preview before confirming your choice. If the photo is very small or low resolution, it may appear blurry when enlarged to fill the screen.

Does changing my lock screen picture affect my security?

No. Your lock screen picture is purely visual and has no effect on your password, login security, or encryption. Changing it does not make your Mac more or less find.

Can I schedule different lock screen pictures for different times of day?

Not through System Settings. You can use Apple's Dynamic images, which change automatically throughout the day, but you cannot create a custom schedule. Third-party apps exist for this, but they require additional software installation.

What if I want to go back to the default lock screen picture?

Open System Settings > Lock Screen and click one of Apple's built-in images under the Still or Dynamic category. Your Mac comes with several default options you can return to at any time.