Highlight unique/duplicates [Conditional formatting]

Excel has a few built-in conditional formatting features, one of them highlights values that have at least one duplicate. The other one highlights unique values meaning there is only one instance of the value in the range.

How to apply conditional formatting

Select the cell range containing the values.
Go to tab "Home" on the ribbon if you are not already there.
Click "Conditional formatting" button.
Click on "Highlight Cells Rules".
Click "Duplicate values..."
A dialog box shows up, here you can choose from duplicate or unique .
Choose a formatting you want to apply.
- Light red Fill with dark red text
- Yellow fill with dark yellow text
- Green Fill with dark green text
- Light red fill
- Red text
- Red border
- Custom format...
If you pick "Custom Format..." the following dialog box appears.
Click OK button.
Click OK button.

The following image shows unique values highlighted.

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