We show you how to highlight duplicates in Google Sheets using the COUNTIF and ARRAYFORMULA functions under the conditional format rules.

Install the Remove Duplicates add-on from the Google Workspace Marketplace. In your sheet, click Extensions, then Remove Duplicates, and choose: Find Duplicates or Uniques.

The duplicates will be highlighted in the A column. Google Sheets also provides further customization options for highlighting duplicates such as making them bold or changing their color.

Learn how Google Sheets gives you tools to sort ranges, compare cells, and remove duplicates quickly.

You can delete duplicate rows in Excel and Google Sheets using this simple trick. You need Remove Duplicates add-on for Google Sheets.