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Remove Duplicate Rows

Clean your spreadsheet without the spreadsheet headache. Choose the columns that define a duplicate, preview the result and keep the first matching row.

Processed on your device
  • Choose matching columns
  • Before and after counts
  • Download CSV or XLSX data
Works in your browser · Your files stay hereFree · No account · No daily task limit
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How to use Remove Duplicate Rows

  1. Choose an Excel, CSV or TSV file and its worksheet.
  2. Select the columns used for exact, case-sensitive duplicate matching.
  3. Review the cleaned rows and download CSV or XLSX data.

Remove Duplicate Rows: your questions answered

Which duplicate is kept?

The first occurrence remains. Matching is exact and case-sensitive across your selected columns; the optional header row is kept separately.

Is my spreadsheet uploaded?

No. This tool processes spreadsheets in a browser worker on your device.

Are Excel formulas calculated?

No. The viewer shows formulas and their saved results where available. Missing cached results are marked as unknown. Exported data contains values rather than live formulas.

What workbook features are preserved?

Viewing leaves the original file unchanged. Data exports contain the selected worksheet values; charts, styling, macros and other worksheets are not preserved. Inputs are limited to 20 MB, 20,000 rows, 256 columns and 500,000 cells per workbook.

Privacy

This tool runs entirely in your browser. Your file is processed on your device and is not uploaded to a server. You do not have to take that on trust — the monitor directly beneath the tool reads your browser’s own record of every request this tab made while your file was open.

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