Remove Duplicates From CSV Online
How do you remove duplicate rows from a CSV? Drop your file below and click "Remove duplicates". Optionally pick which columns define a duplicate (e.g. just Email). The cleaned file downloads instantly, with a count of removed rows. Free and fully private.
Drop your CSV file here or click to browse
Processed locally — never uploaded
How to remove duplicate rows (step by step)
- Add your file. Drag and drop the CSV or click the box to browse.
- Choose match columns (optional). By default the entire row must match to count as a duplicate. Tick specific columns, like Email or ID, to dedupe on those alone.
- Click "Remove duplicates". The first occurrence of each row is kept, in the original order.
- Download the cleaned file and see exactly how many duplicates were removed.
Frequently asked questions
How do I remove duplicate rows from a CSV file?
Drop your CSV into the tool above and click "Remove duplicates". The first occurrence of each row is kept, repeats are removed, and a cleaned file downloads instantly. It all runs locally in your browser.
Can I deduplicate based on specific columns only?
Yes. After loading a file, tick the columns that should define a duplicate (for example just the Email column). Rows matching on those columns are treated as duplicates even if other columns differ.
Which duplicate row is kept?
The first occurrence in file order is kept; later repeats are removed. The original row order is preserved in the output.
How many duplicates were removed?
After processing, the tool reports exactly how many duplicate rows were removed and how many unique rows were kept.
Is my data safe?
Yes. Deduplication happens entirely on your device. The file is never uploaded, so it is safe for customer lists and other sensitive data.