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How to automatically remove duplicates form a list in Excel?

In Excel, we can use the Remove Duplicates feature to remove the same values from a list, but is there any trick to auto remove the duplicates from the list? In this article, I introduce the tricks on automatically removing duplicates if there is duplicate appearing in a specify Excel column.

Auto remove duplicates from a list by Data Validation

Auto remove duplicates from a list by Kutools for Excel good idea3

Auto remove duplicates from a list by Data Validation

1. Click Data > Data Validation. See screenshot:
doc auto delete duplicate 1

2. In the popping dialog, under Settings tab, select Custom form Allow list, and type this formula =COUNTIF($A$1:$A$20,A1)=1 into the Formula text box. See screenshot:
doc auto delete duplicate 2

In the formula, A1:A20 is the range you want to auto remove duplicate from.

3. Click OK. And now if you type a duplicate value, a warning dialog will pop out.
doc auto delete duplicate 3

Auto remove duplicates from a list by Kutools for Excel

If you are not familiar with formulas, you can apply Kutools for Excel’s Prevent Duplicate utility to stop from duplicates being typed in range at once.

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!)

Select the range or a column you want to auto remove duplicates, and then click Kutools > Prevent Typing > Prevent Duplicate. See screenshot:
doc auto delete duplicate 4

Some dialogs pop out for reminding you some notices, click Yes > OK to close the dialogs.
doc auto delete duplicate 5

Now a warning dialog pops out to remind you while you try to enter duplicate values.
doc auto delete duplicate 6

Here is another relative utility called Prevent Typing, you can specify the character you want to prevent typing or only allow typing in a list as below screenshot show:
doc auto delete duplicate 7

Tip. If you want to have a free trial of the above functions, please go to free try Kutools for Excel first, and then go to apply the operation according above steps.

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