To change login wallpaper, System Preferences > Desktop & Screen Saver > choose and customize image. When you change your profile photo, the change occurs on all devices using the same Apple ID/Apple ...

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You can now change the Windows login UI screen with or without the use of third-party software or hacks. Windows now supports the ability to load images into the login screen’s background. Although ...

Windows 10 users can now alter the default login screen background with a single-click, thanks to the release of Windows 10 Login Background Changer utility from some independent GitHub developers.