Highlight Duplicate Column Cells In Google Sheets

Highlight Duplicate Column Cells In Google Sheets

Assume you have data like below and want to highlight the duplicate values:

Names
Liam
Noah
Oliver
Elijah
Henry
Alexander
Oliver
William
James
Benjamin
Lucas
Noah

To highlight, click on "Format" and select "Conditional Formatting"

Now select formatting RULE as "Custom Formula" and enter below formula.

=countif(A:A,A1)>1