In your sheet, click Extensions, then Remove Duplicates, and choose: Find Duplicates or Uniques. Follow the steps in the add-on wizard to choose the range and columns you'd like to check for ...

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

How to remove duplicates in Excel for a single column When you have duplicate data that you want to remove from a single column in your dataset, start by clicking into the column you want to dedupe.