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.

Microsoft Excel is perhaps the most powerful spreadsheet application you can buy. But it also has some simple functions, like finding duplicates in data.