Sign in to the Microsoft 365 Admin Center
- Go to admin.microsoft.com.
- Sign in with your admin credentials.
Navigate to Organization Profile
- In the left-hand menu, click Settings > Org Settings.
- Select Organization Profile.
Edit Custom Themes
- Scroll down and click “Manage custom themes for your organization.”
- Click Edit next to the theme you want to customize.
Upload Your Logo
- Upload a logo image that is 200 x 30 pixels in size.
- You can also set a background image, accent color, and sign-in page text.
Save Changes
- Click Save.
- It may take a few minutes for the changes to propagate across Microsoft 365 services.
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