Remove Duplicate CSV Rows by Key Columns
Find and remove repeated CSV records using all columns or selected keys such as MID, Country and Payment System. Handles quoted CSV cells.
CSV duplicate remover for Excel exports
Upload a CSV export or paste CSV data. Specify key column names or 1-based column positions. Select whether to keep first occurrence or show repeated groups.
All conversion work is performed locally in your browser. Guides and examples · All tools
Choose a duplicate key before removing rows
Deduplication by all columns removes fully identical records. Deduplication by an ID column may remove rows that differ in country, timestamp or status. If your CSV contains MID,Country,Method, the records A101,UA,Card and A101,PL,Card might both be necessary even though the MID repeats.
The converter supports named key columns (when the file has a header) or 1-based column numbers. With no key columns selected, all cells form the key. Select the duplicate-groups mode if you need to inspect repeated records before removing them.
Read the detailed CSV deduplication guide for sample data, Excel alternatives and common pitfalls.
Important CSV details
Quoted fields can contain commas, doubled quotes and line breaks. Check the delimiter before processing the file. If identifiers contain leading zeros, beware of spreadsheets that automatically convert CSV fields to numbers. Keep a backup, review the result and use a reliable timestamp rule when you actually need to keep the most recent row rather than merely the first one.