Restart your Mac and you should see your new login screen wallpaper.If you would like to convert your image to png, open it in the Preview app, select File, and choose the Export command.Drag your own image into the folder and rename it “lockscreen.png”.Keeping a copy of the old image is a good idea, just in case you change your mind in the future and want to revert to the old lock screen image. Rename the file “lockscreen-old.png” and leave it in the folder. You should see a folder with a file called “lockscreen.png”.Open a Finder window, select Go in the menu bar and then select Go to Folder. Type /Library/Caches/Desktop Pictures into the address field and click Go.You just need to locate the default image and replace it with your own. macOS Big Sur Login Screen Default Background Image macOS Big Sur System Preferences Desktop & Screensaver How to Change macOS Big Sur Login Screen Background ImageĮven though it’s not an option in System Preferences, changing the login screen background image in macOS Big Sur is very easy. If you would like to change the Lock Screen wallpaper, you can do it by going into System Preferences, then Desktop & Screensaver. It’s not the Lock Screen that shows up when you lock your Mac. Lock Screen vs Login Screenįirst off, the login screen is the screen you see when your Mac boots up and asks for the password. What if you want to change the login screen background image? In this post, we look at how to do just that for macOS Big Sur. You just simply go into System Preferences, then Desktop & Screensaver.

Change background mac big sur