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Remove Duplicates (CSV / TSV / Excel)

Processes in your browser

Upload a file, preview columns, choose duplicate keys and rules, then download cleaned data. Supports .csv, .tsv/.txt, and .xlsx.

Tip: Your Excel file’s first sheet will be used. For very large files, CSV/TSV is faster.
Parsing file…
Duplicates are rows where the selected columns have the same values.
Total rows: –
Duplicate rows: –
Rows after clean: –
Preview
Rows marked as “duplicate” in preview are examples only; cleaning applies to the full dataset.
Download Cleaned Data

Duplicates removed according to your rules.

Download Only Duplicates

All rows that were removed during cleaning.

How this works
  • Parse your file locally (no upload to server).
  • Pick columns to compare (e.g., Email, Phone).
  • Choose whether to keep first or last duplicate.
  • Download the cleaned CSV or duplicates only.
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Tips
  • For Excel with multiple sheets, put data on the first sheet.
  • “Case-insensitive” treats A and a as identical.
  • “Trim spaces” converts " John " → "John".
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