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Remove Duplicate CSV Rows

Keep the first exact occurrence of each data row.

Enter your values

Your inputs are processed locally. Review the method and limitations before relying on the estimate.

Upload a CSV file (maximum 3 MB) or paste its text below. Nothing is transmitted to our server. For spreadsheet CSV exports, formula defense may change raw cell text; use JSON when exact data preservation is essential.

Browser processing is bounded to 3 MB per file and at most 15,000 parsed CSV rows. Download the output to keep a copy; nothing is saved here.

Worked example

Duplicate rows with the same text in each cell are removed after the first occurrence.

Frequently asked questions

Are my files uploaded?

No. Files are read by JavaScript in this browser; no server processing or background upload is used.

Are spreadsheet formulas executed?

No. Input is treated as plain text. CSV export applies defense-in-depth spreadsheet formula escaping, which can change the literal exported cell value.