CSV Duplicate Finder

CSV Duplicate Finder.

Find duplicates in CSV data — identify full-row and key-column duplicates instantly and privately.

Your files never leave your device

Drop your CSV file here, or click to browse

CSV files · Processed locally · Max recommended 50 MB

Key column (optional)

Leave empty to detect full-row duplicates

Find Duplicate Rows in CSV Files

Duplicate rows are one of the most common CSV data quality issues. Our duplicate finder scans your entire file locally and groups duplicates by full row content or a specific key column like email or ID.

Use the CSV Cleaner to remove duplicates after identification.

Frequently Asked Questions

How are duplicates detected?

By default, full-row duplicates are detected. You can optionally specify a key column to find duplicates based on a single field.

Can I see which rows are duplicated?

Yes. Each duplicate group shows the row numbers and count.