How are duplicates detected?

By default the entire row is compared; you can instead pick one column to use as the duplicate key.

Which row is kept when duplicates are found?

The first occurrence of a duplicate is kept and later matches are removed.

Is my CSV data uploaded anywhere?

No, deduplication runs entirely in your browser.

CSV Deduplicate

Remove duplicate rows from a CSV file, optionally matching on a single key column.

DelimiterMatch duplicates byUpload CSV file

Input

Removed 1 duplicate row(s).

Output

name,email,age
Alice,alice@example.com,30
Bob,bob@example.com,25

Paste your CSV and this tool strips out duplicate rows, either by comparing the whole row or just one key column you choose. Processing stays fully client-side.

How to use

Paste your CSV text or upload a .csv file.
Optionally choose a key column to match duplicates on, otherwise the whole row is compared.
Copy or download the deduplicated CSV.

Frequently asked questions

How are duplicates detected?: By default the entire row is compared; you can instead pick one column to use as the duplicate key.
Which row is kept when duplicates are found?: The first occurrence of a duplicate is kept and later matches are removed.
Is my CSV data uploaded anywhere?: No, deduplication runs entirely in your browser.

Related tools

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CSV Column Extractor