For tables with 10,000 rows or more, use the built-in "Remove Duplicates" tool on the "Data" tab.

It works quickly but deletes rows permanently — always create a copy of the sheet first.

If you need to find and analyze matches instead of deleting, you'll need formulas. A detailed breakdown of methods, including comparing two lists for duplicates, is available in the guide on comparing lists in Excel using formulas to check for duplicates and discrepancies.

🔗 Source: excel.rf