How to highlight duplicates microsoft excel
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To highlight duplicates in Microsoft Excel, use Conditional Formatting to visually mark repeated values within a selected range.
Using Conditional Formatting (Windows and Mac)
Select the cells that require duplicate detection.
Open the Home tab.
Select Conditional Formatting.
Select Highlight Cells Rules.
Select Duplicate Values.
Choose a formatting style from the dropdown.
Select OK.
Excel highlights every value that appears more than once in the selected range.
What counts as a duplicate in Excel?
A duplicate is any value that appears two or more times within the selected range, based on exact matching of text, numbers, or dates.
Text comparison ignores capitalization.
Numeric comparison requires identical values.
Date comparison requires identical serial date values.
How to highlight duplicates in a single column?
To highlight duplicates in a single column, apply Conditional Formatting after selecting only that column.
Select the column.
Open Conditional Formatting.
Select Highlight Cells Rules.
Select Duplicate Values.
Select a format.
Select OK.
Duplicates are evaluated only within the selected column.
How to highlight duplicates across multiple columns?
To highlight duplicates across multiple columns, select all relevant columns before applying Conditional Formatting.
Select the full range across columns.
Open Conditional Formatting.
Select Highlight Cells Rules.
Select Duplicate Values.
Select a format.
Select OK.
Excel checks duplicates across the entire selected range, not column by column.
How to highlight unique values instead of duplicates?
To highlight unique values, change the rule option inside the Duplicate Values dialog.
Select the target range.
Open Conditional Formatting.
Select Highlight Cells Rules.
Select Duplicate Values.
Change the dropdown from Duplicate to Unique.
Select a format.
Select OK.
Unique values receive formatting, while duplicates remain unchanged.
How to customize duplicate highlighting with formulas?
To customize duplicate highlighting, use a formula-based Conditional Formatting rule.
Formula for duplicates in a column
Use this formula when column A contains the data:
=COUNTIF($A:$A,A1)>1
This formula highlights every cell in column A that appears more than once.
Formula for duplicates in a specific range
Use this formula when the range is A1:C100:
=COUNTIF($A$1:$C$100,A1)>1
This formula highlights duplicates across the defined range.
Steps to apply the formula rule
Select the target range.
Open Conditional Formatting.
Select New Rule.
Select Use a formula to determine which cells to format.
Enter the formula.
Select Format and choose the styling.
Select OK.
What is different between Windows and Mac?
The feature set is the same.
Menu placement differs slightly.
Keyboard navigation differs by operating system.
Windows uses ribbon shortcuts.
Mac uses system-style menus.
How to remove duplicate highlighting?
To remove duplicate highlighting, clear Conditional Formatting rules.
Select the affected cells.
Open Conditional Formatting.
Select Clear Rules.
Select Clear Rules from Selected Cells.
All duplicate formatting is removed instantly.
Does highlighting duplicates delete data?
No. Highlighting duplicates applies visual formatting only and leaves the underlying data unchanged.
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