Excel Duplicate Checker

Simply paste Excel columns to identify duplicate data and occurrence counts. Supports line-break separated data.

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Input Data

Analysis Results

Enter Excel column data and click the "Analyze" button.

Use Cases

This tool is useful for:

  • Checking duplicates in customer lists or email address lists
  • Verifying duplicates in product codes or model numbers
  • Identifying duplicate respondents in survey responses
  • Checking item duplicates in inventory management
  • Finding duplicate data during data cleansing tasks

Tip: Simply select a column in Excel, copy with Ctrl+C (Cmd+C), and paste into this tool's input field with Ctrl+V (Cmd+V) for easy use.

How to Use

  1. Copy a column from Excel and paste it into the input field.
  2. Click the "Analyze" button to start duplicate detection.
  3. Results will show the occurrence count and duplicate status for each data item.
  4. Use "Show duplicates only" to filter duplicate data.
  5. "Export duplicates" copies duplicate data to clipboard.
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