Change Mac Lock Screen: Wallpaper, Message, and Settings
You can change a Mac’s lock screen by changing its wallpaper in System Settings, and you can add an optional message or adjust when the screen locks. The exact controls vary slightly by macOS version, but the main settings are in System Settings under Wallpaper and Lock Screen.
Change the lock screen wallpaper
- Open the Apple menu and choose System Settings. On older macOS versions, open System Preferences.
- Select Wallpaper in the sidebar. Browse the available categories, or choose a picture from your own files using the option to add a photo or folder.
- Select the image you want. Depending on the macOS version and wallpaper, the desktop background and the image shown when the Mac is locked may use the same selection.
- Press Control-Command-Q to lock the Mac and check the result. You can also use the Apple menu and select Lock Screen.
On some versions, the lock screen uses the current desktop wallpaper, while the login window may show a different appearance or crop. If your chosen image does not appear as expected, check the desktop first, then lock the Mac and inspect the login screen. A restart is usually unnecessary; changing the wallpaper or locking and unlocking the Mac is a useful first check.
Change the login screen message
A message can help identify a Mac or tell someone how to return it if it is lost. It is separate from the wallpaper and appears on the login screen when enabled.
- Open System Settings from the Apple menu.
- Select Lock Screen in the sidebar.
- Find the setting for showing a message when the screen is locked. Turn it on, then use the message control to enter your text.
- Lock the Mac to confirm that the message is visible and readable.
The wording and location can differ across macOS releases. Older versions may put this option under Security & Privacy, then General, where you may need to click the lock icon and authenticate before changing it. If the setting is missing or unavailable, the Mac may be managed by a workplace or school administrator.
Keep the message useful but discreet. A return email address or general instruction is safer than a home address, phone number, travel schedule, or other sensitive personal information displayed to anyone who can see the screen.
Adjust when the Mac locks
The Lock Screen settings also control how quickly the display turns off and how soon a password is required after the screen saver begins or the display is switched off. Available choices depend on the Mac and macOS version. To find them, open System Settings and select Lock Screen.
- Turn display off when inactive: Sets how long the Mac waits before switching off the display. This affects the screen, not necessarily whether the Mac itself goes to sleep.
- Require password after screen saver begins or display is turned off: Determines whether and how soon authentication is required to return to the Mac.
- Start screen saver when inactive: If shown, this controls a screen saver separately from the lock screen wallpaper.
For a shared or portable Mac, requiring a password immediately or after a short delay reduces the time an unattended session remains accessible. On a personal Mac in a controlled setting, choose a delay that suits how you use it. A longer delay is more convenient but leaves an unlocked session available for longer if you walk away.
Use a personal photo
To use your own image, first make sure it is saved somewhere you can find, such as Pictures. In System Settings > Wallpaper, choose the control to add a photo or select a folder, then pick the image. The precise button name may vary by macOS release.
For a clean result, choose an image with enough resolution for your display and keep important details away from the edges, where the image may be cropped to fit. A very wide or tall picture can be scaled or cropped differently on different displays. If you use multiple displays, check each one: wallpaper choices and framing may not look identical across screens.
Some wallpapers are dynamic or change with time, appearance, or other settings. If you want a fixed picture, select a still image rather than a dynamic option. If a photo is stored on an external drive that is disconnected, or in a location the Mac cannot access, it may not remain available as expected; choosing a file stored locally is a straightforward troubleshooting step.
Why the lock screen may not change
First confirm that the selection was made under Wallpaper, not just in an app that temporarily displays a picture. Then lock the Mac and check the login screen. The desktop, screen saver, and lock screen are related but distinct: changing one does not necessarily change every other screen element.
- The image is cropped or looks different: Try a higher-resolution image with a composition suited to the display. The screen’s aspect ratio affects framing.
- The wallpaper reverts: Check whether a dynamic wallpaper, rotating collection, or another user account is selected. Confirm the image file is still available.
- A setting is greyed out or absent: Check whether the Mac is managed by an organization. Contact its administrator rather than trying to override management restrictions.
- The lock screen is unchanged after selecting a picture: Lock the Mac again, check the desktop wallpaper selection, and restart only if ordinary checks do not resolve the display.
Changing the wallpaper does not disable the password or otherwise change account authentication. Likewise, adding a lock screen message does not make the Mac easier to unlock; it only adds text to the screen.
Frequently Asked Questions
Can I set a different lock screen wallpaper from my desktop wallpaper?
It depends on the macOS version and the screen in question. Many setups use the selected desktop wallpaper for the lock screen, while the login window can look different. Check the result by locking your Mac.
How do I lock my Mac quickly?
Press Control-Command-Q, or open the Apple menu and choose Lock Screen. The display locks without requiring you to shut down the Mac.
Can I add my name or contact information to the lock screen?
Use the message option under System Settings > Lock Screen, if available. Consider using only a safe return method, such as a general email address, rather than displaying sensitive details.
Why does my Mac show a different picture at login?
The desktop wallpaper, screen saver, and login window are not always identical. Image cropping, multiple displays, dynamic wallpaper, and macOS version can also affect what appears.
Can I change the lock screen on a work or school Mac?
You may be able to change ordinary wallpaper settings, but an administrator can restrict or manage settings on an organization-owned Mac. Ask the administrator if a control is unavailable.
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