Does it require every column to match for a row to count as a duplicate?

By default yes — rows must be identical across all columns to be flagged as duplicates.

Which copy of a duplicate row gets kept?

The first occurrence is kept and later repeats are removed, preserving the original row order.

Can I check for duplicates based on just one column, like an ID?

This tool compares full rows — for duplicates based on a single key column, extract that column first or filter manually afterward.

Does Remove Duplicate Rows upload my files to a server?

No. Remove Duplicate Rows runs entirely in your browser using on-device processing, your files never leave your device.

Remove Duplicate Rows

Delete repeated rows from a CSV file.

Runs in your browser

CSV input

First row is a header

About this tool

Data pulled from multiple exports, merged spreadsheets, or repeated form submissions often ends up with the same row appearing more than once, which skews any totals or counts calculated from it. This tool scans a CSV for identical rows and removes the repeats, leaving one copy of each, which is the standard cleanup step before trusting a dataset's row count or running any aggregate analysis on it.

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