Add your logo
You can brand your Google services window with your organization's identity by uploading a custom logo to your Admin console. The logo appears in the upper left corner of most Google services when your users and administrators sign in. If you have multiple domains associated with your Google account, the same logo appears for users at all domains.
The logo you upload can be in either PNG or GIF format. The file size must not exceed 30KB, and the maximum recommended dimensions are 320 x 132 pixels. Images with smaller dimensions will be scaled, but you must preserve the aspect ratio or the logo will fail to upload. Larger images aren't permitted.
Sign in to the Google Admin console.
From the dashboard, click Company profile > Personalization.
Select the radio button next to Custom logo.
Click Choose File to select the appropriate file.
Note: If you don't see your custom logo right away, try refreshing your browser window or clearing your browser's cache. Note that changes to your logo might take up to one hour to appear.