Free tool · CSV duplicates

Remove duplicate rows from a CSV file online

Drop a CSV and SheetFix removes exact duplicate lines while keeping your header, column order and text values (like leading zeros) intact. Similar rows are flagged, not deleted.

How it works

  1. 01
    Upload your CSV

    Commas, semicolons, tabs and pipes are detected automatically.

  2. 02
    Check what goes

    See exactly which duplicate rows are removed before you download.

  3. 03
    Download the clean CSV

    Export as UTF-8 CSV with the same columns, or as Excel.

Frequently asked questions

Does it keep the header row?+

Yes. The header is never treated as a data row and column order stays the same.

Are leading zeros and IDs preserved?+

Yes. Values are kept as text, so 00123 stays 00123.

Does it work with large CSV files?+

Processing runs in a background worker in your browser. Download limits depend on your plan (Free: 5,000 rows).

What counts as a duplicate?+

A row whose values are identical to an earlier row in every column. Rows that only differ in spacing or capitals are flagged for review.

Is my CSV uploaded?+

No. The file stays in your browser.