CSV Deduplicator

A CSV deduplicator helps you remove repeated rows from a dataset before you import, share, or analyze it. You can paste or upload a CSV file, choose which columns should be compared, and decide whether the tool should keep the first or the last matching row.

Useful for cleanup work

Duplicate data often appears in contact exports, signup lists, product feeds, and merged reports. In some cases you want to compare every column, while in others you only care about a few fields such as email address, customer ID, or username. This tool makes that choice explicit instead of forcing a one-size-fits-all cleanup.

What the tool checks

It can compare rows with or without case sensitivity, so values like [email protected] and [email protected] can be treated as equal or different depending on your workflow. The result includes a summary of how many duplicates were removed and how many unique rows remain.

Because everything runs in your browser, deduplicating sensitive CSV files is fast and private. It is an easy way to clean exports before they move into a CRM, a spreadsheet, or another data pipeline.