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How to mark duplicate values with color in Excel?

As we all know, there is a function called Remove Duplicates in Excel, which can help you quickly remove duplicate values from a list. However, in some cases, you do not need to remove duplicates but only want to mark the duplicate values with different color as below screenshot shown. In this time, how can you solve this job quickly in Excel?
doc mark duplicate with color 1

Mark duplicates with color by Conditional Formatting

Mark duplicates by formulas

Identify and mark duplicates with color by Kutools for Excel good idea3


Select Duplicate & Unique Cells (quickly select duplicate or unique values in a column.

doc highlight duplicate across columns 6
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arrow blue right bubble Mark duplicates with color by Conditional Formatting


The Conditional Formatting feature can do you a nice favor on marking duplicates with color.

1. Select the list you want to mark the duplicate values from, click Home > Conditional Formatting > Highlight Cells Rules > Duplicate Values. See screenshot:
doc mark duplicate with color 2

2. In the Duplicate Values dialog, select Duplicates from left drop down list, the go to right drop down list to select one format as you need to mark the duplicate values, you also can click Custom Format to choose the color as you need under Fill tab in the popped out Format Cells dialog. See screenshot:
doc mark duplicate with color 3

3. Click OK, the duplicate values are marked with color.
doc mark duplicate with color 4


arrow blue right bubble Mark duplicates by formulas

If you just want to mark the duplicate values, you can apply a formula to make it outstanding.

Copy and paste one of below formulas to a blank cell, B2 for instance,

=COUNTIF($A$2:$A$12, A2)>1

=IF(COUNTIF($A$2:$A$12, $A2)>1, "Duplicate", "Unique")

Then drag auto fill handle down to copy the formula to the cells, if the cell displays TRUE or Duplicate, the relative cell is duplicate, or it is unique. Screenshot:
doc mark duplicate with color 5     doc mark duplicate with color 6


arrow blue right bubble Identify and mark duplicates with color by Kutools for Excel

If you want to both select and mark duplicate values with color in Excel, there is no built-in function can help you. However, if you have Kutools for Excel – a multi-function add in tool, you can apply its Select Duplicate & Unique Cells utility to solve this job easily.

Kutools for Excel, with more than 120 handy functions, makes your jobs easier. 

After installing Kutools for Excel, please do as below:(Free Download Kutools for Excel Now!)

1. Select the list you want to find duplicates and mark, click Kutools > Select > Select Duplicate & Unique Cells. See screenshot:
doc mark duplicate with color 7

2. In then Select Duplicate & Unique Cells dialog, check Duplicates (Except 1st one) or All duplicates (Including 1st one) option as you need, then go to Processing of results section to specify the background or font color as you need. See screenshot:
doc mark duplicate with color 8

3. Click Ok, and a dialog pops out to remind you how many duplicates have been selected.
doc mark duplicate with color 9

4. Click OK to close it.
doc mark duplicate with color 10  doc mark duplicate with color 11

Tip. If you want to have a free trial of the Select Duplicate & Unique Cells function, please go to free download Kutools for Excel first, and then go to apply the operation according above steps.


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