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FREE WEB TOOL

Find Duplicate Rows or Keys in a CSV

Find identical rows or duplicate keys in selected CSV columns.

Find duplicates

Files are processed in your browser and are not sent to our server.

About this tool

Find Duplicate Rows or Keys in a CSV is a free web tool from BlueprintLab Tools. Find identical rows or duplicate values in selected CSV columns, such as item numbers, email addresses, and customer IDs, before import.

Use it when you need to inspect, compare, clean, or transform CSV and structured data quickly.

No account is required. The tool is designed to complete the task directly in your browser with a short input → process → result flow.

How to use

  1. Choose the file you want to check.
  2. Select “Find duplicates”.
  3. Review the detected issues and save the result if needed.

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