CSV Deduplicator by Column
Paste CSV, pick a column, and remove duplicate rows while keeping the first match.
Remove duplicate rows by the right key
CSV exports often include duplicate contacts, URLs, products, or IDs. This tool reads the header row, lets you choose the column that defines a duplicate, and keeps the first row for each unique value.
Use it for small cleanup jobs before importing lists into CRMs, spreadsheets, or content systems.
Local CSV cleanup
Your file contents are not uploaded.
Frequently Asked Questions
What does this deduplicator do?
It removes duplicate CSV rows based on the selected column while keeping the first matching row.
Does it handle quoted CSV perfectly?
It handles common quoted values, but very complex CSV exports should still be reviewed.
Can I choose any column?
Yes. The tool reads headers from the first row and lets you choose the dedupe key.
Is my CSV uploaded?
No. Cleanup happens locally in your browser.
Clean up data faster with browser utilities.