How to undo remove duplicates in excel

Answer

Yes, it is possible to undo removing duplicates in Excel, but it depends on the actions you take after performing the removal.

1. Immediately after removing duplicates
   Excel allows you to undo the last action using the Undo feature. This will restore all the original data that was removed.

   Steps:

   1. Press Ctrl + Z on Windows or Command + Z on Mac.

   2. Alternatively, click the Undo button in the Quick Access Toolbar at the top-left corner of Excel.

   Condition: Undo must be performed immediately before making any other changes in the workbook. Once you perform another action, the previous data may be permanently lost.

2. If you saved the workbook after removing duplicates
   Yes, undoing becomes difficult after saving the file because Excel clears the undo history upon saving.

   Options:

   1. Open a previous version of the file if your system has version history enabled.

      • On Windows, right-click the file in File Explorer → Properties → Previous Versions → select the version to restore.

      • On Mac, use Time Machine to restore the previous version.

   2. Restore the data from a backup copy of the workbook if one exists.

3. Preventive measures for future edits

   1. Before removing duplicates, copy the data to another sheet or workbook.

   2. Use Excel’s Table feature to work with data dynamically, which allows filtering duplicates without permanent deletion.

Example:
Suppose column A contains 100 names, and you remove duplicates. Pressing Ctrl + Z immediately restores all original 100 names. If you save and close the file, you must restore a previous version or backup to recover the removed entries.

This ensures your original data is always safe while experimenting with duplicate removal.

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