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.

If you’ve added the same data more than once by mistake on a spreadsheet or you’re simply looking to find duplicate data, Google Sheets lets you highlight them.

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