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CleanCSV AI
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Remove Duplicate Rows from CSV Online

Upload a messy CSV, detect duplicate rows instantly, and export a cleaner file without rewriting formulas or scripts.

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Upload a messy spreadsheet

Supports CSV, TSV, XLSX, and XLS. Current plan: Free with files up to 1 MB and 5 analyses per day.

Download a sample messy CSVDownload a split-column sample

Why it matters

  • Duplicate rows create double counting in reports, dashboards, and warehouse imports.
  • Exact duplicate detection is fast and deterministic, so you can review the issue before editing the file.
  • A change log makes it obvious how many repeated rows were removed.

How CleanCSV handles it

  1. Upload the CSV or spreadsheet that needs cleanup.
  2. Review duplicate row examples in the diagnostic report.
  3. Select the duplicate-row fix and export the cleaned file.

FAQ

Does CleanCSV keep the first copy of each row?

Yes. The current fix flow keeps the first occurrence and removes later identical rows.

Can I preview duplicates before exporting?

Yes. The report lists duplicate examples and provides a before and after preview after fixes run.

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