Error: "Username or password is invalid"

If you can successfully log in to the online Grammarly Editor at, but still see this error message, this means that you are using an outdated version of Grammarly for Microsoft Office:  


To resolve this issue, please reinstall Grammarly for Microsoft Office by following the steps below: 

  1. Uninstall your current version of the Grammarly add-in via Control Panel > Programs and Features > right-click on Grammarly for Microsoft® Office Suite > select Uninstall.

    If you use Windows 10:
    Right-click the Start button in the lower left corner of the screen, and select Apps and Features on the pop-up menu. Click on Grammarly for Microsoft® Office Suite > select Uninstall.

  2. Download the latest version from and follow the instructions on that page to install it.
  3. Open any text document in Word, find the Grammarly tab in the toolbar, then click Open Grammarly.
  4. Log in using your Grammarly credentials if prompted.
  5. You should see the Grammarly sidebar on the right. It should say Checking... and then start displaying suggestions.


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