CSV Duplicate Finder.

What it does

Find duplicate rows or key-column duplicates in CSV data.

Why use it

CSV Duplicate Finder helps you find duplicates in csv in your browser — fast, private, no upload required.

Example input

id,name
1,Alice
2,Bob
1,Alice

Example output

1 duplicate row in 1 group

Group 1 (key: row):
  id=1, name=Alice (×2)

Frequently Asked Questions

Is my data uploaded when using CSV Duplicate Finder? ▾

No. All processing runs locally in your browser. Your files never leave your device.

Do I need an account? ▾

No account is required. All tools are free and work instantly.