RomitCSV
Free CSV validation tool

CSV Duplicate Checker

Find repeated complete data rows in a CSV file and report the first and duplicate row numbers.

What this tool checks

The checker compares complete rows, including every field, and reports later copies with their first occurrence row. The first row is treated as the header and is excluded from duplicate checking.

How to use it

  1. Choose a CSV or TSV file up to 50 MB.
  2. Set any requested options and run the check.
  3. Review the report or download it as a CSV file.

The file is read and analyzed in your browser. It is not sent to the RomitCSV server. Use the CSV Validator for a general structure check or browse all CSV tools.