Customize AD FS Login Screen – Company Logo
To update the company logo on your AD FS login screen, open PowerShell as administrator on the AD FS server, and type the command:
set-adfswebtheme -targetname <your theme name> -logo @{path=”<path to the image”}
The theme name that is delivered with the AD FS configuration is “default”, but you have the option of creating and customizing your own themes.