Installing a Custom Theme in SharePoint Online with PowerShell

Wishv Prajapati

July 25, 2024

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Steps: 

1. Download and Install SharePoint Online Management Shell 
   • Visit the Microsoft download page for SharePoint Online Management Shell.
     
2. Create a custom theme using the Theme Generator Tool
   • Navigate to this URL to generate your new theme 
   • You can use the Colour section to choose your custom Colours that match your brand. You will get to see the sample page render in real-time, showing you what the page will look like with new Colours.
   • Next, click Export theme in the upper-right-hand-corner. On the next screen, choose PowerShell tab, then copy all of the text into a Notepad.

     

3. Start SharePoint Online Management Shell: 
   • After installation, click on the SharePoint Online Management Shell to open it.

     

4. Connect to SharePoint Online: 
   • Paste the following command in the promptConnect-SPOService -Url https://domain-admin.sharepoint.com
     (where domain is your SharePoint domain name)
   • Press Enter and provide your SharePoint admin credentials when prompted

     

5. Paste the Theme Script: 
   • At the command prompt, type in $themepalette = then paste the code you exported. It should look like the image below. Press Enter.
   • Next, type the following command:
     Add-SPOTheme -Identity “Name of your theme” -Palette $themepalette -IsInverted $false

     **Where Name of your theme is a theme name you want to give/assign to the theme. **

     

   • We can now change to this new theme in SharePoint.
6. Verify Installation: 
   • The custom theme is now installed in your SharePoint Online tenant.
   • Navigate to any SharePoint site and access the theming options:
     • Click the gear icon (⚙️) in the top right corner. Select “Change the look.”

       

     • You should see the custom theme listed there. (From your organization section)

       

   • This process only installs the theme. You will need to manually apply it to individual sites.