Free CSV Deduplicator Online (Remove Duplicate Rows)
Use this free tool to remove duplicate rows from CSV data. Fast, private, and works directly in your browser.
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What is CSV Deduplicator?
CSV Deduplicator removes repeated rows from CSV data while keeping the first occurrence and the header. It is useful for cleaning exported lists and merged datasets. Processing runs in your browser.
How to use this tool
- Paste your CSV or upload a file.
- Click Remove duplicates.
- Review how many rows were removed.
- Copy or download the cleaned CSV.
Features
- Remove duplicate rows
- Keeps the header row
- Whole-row matching
- Shows how many rows were removed
- Copy or download the result
This tool runs in your browser. Your files and text are not uploaded to our servers, and we do not store your input.
Frequently asked questions
Which duplicate is kept?+
The first occurrence is kept; later identical rows are removed.
Is the header preserved?+
Yes. The header row is kept and not treated as a duplicate.
Is my data uploaded?+
No. Deduplication happens entirely in your browser.
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