About the CSV Duplicate Remover
Clean mailing lists, CRM exports and survey data. Remove rows that are exact duplicates, or deduplicate by specific columns — for example keep only the first row for each email address even if the names differ. Case-insensitive matching treats [email protected] and [email protected] as the same.
Your data is processed in the browser and never sent to a server, so it is safe to paste payloads that contain tokens or personal data.
How to use it
- Paste CSV data or open a file.
- Optionally list the columns to compare (names or numbers).
- Download the cleaned CSV.
Good to know
- The first occurrence of each duplicate is kept, preserving order.
- Column names are matched case-insensitively.