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Finding duplicates in a column means identifying values that appear more than once in the same column. Excel provides automated tools that highlight or extract these repeated entries.nTo find duplicate values in a column:

1. Select the column that contains the values you want to check.

2. Go to the Home tab on the Ribbon.

3. Select Conditional Formatting in the Styles group.

4. Select Highlight Cells Rules.

5. Select Duplicate Values.

6. Select the formatting style you want to use for highlighting.

7. Select OK to apply the rule.

Excel highlights every repeated value instantly. This method works the same on Windows and Mac.

How to filter only the duplicate values

To display only the duplicates in a column:

1. Select the entire dataset.

2. Go to the Data tab.

3. Select Filter.

4. Open the filter arrow on the target column.

5. Select Filter by Color.

6. Select the color used by Conditional Formatting to highlight duplicates.

Excel filters the list to show only the repeated values.

How to remove duplicates but keep the first instance

To remove duplicate values:

1. Select the column that contains the duplicates.

2. Go to the Data tab.

3. Select Remove Duplicates.

4. Confirm the column selection.

5. Select OK.

Excel removes repeated values and keeps the first appearance. The feature works the same on Windows and Mac.

How to list duplicates without removing anything (Advanced Filter method)

To extract duplicate values into another location:

1. Copy the column to a new sheet or an empty location.

2. Select the copied column.

3. Go to the Data tab.

4. Select Advanced in the Sort & Filter section.

5. Select Filter the list, in-place or Copy to another location.

6. Check Unique records only.

7. Select OK.

This method helps create a cleaned version of the column that contains only one instance of each value, making repeated values easier to scan manually.

How to find duplicates with a helper column

When a visual highlight isn't enough, a helper column can identify duplicated entries with a simple label. This requires no formulas when using Conditional Formatting with a helper column.

1. Create an empty column next to your dataset.

2. Enter labels such as Duplicate manually for each highlighted cell (after using Conditional Formatting).

3. Use filtering to view all labeled duplicates.

This method supports sorting and downstream analysis.

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