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.

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.

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

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