Remove duplicate CSV rows while optionally keeping the header row at the top.
Rows before
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Rows after
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Removed
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Enter the example value or paste your own input, choose the mode when one is available, and read the first result card for the direct answer. The output area gives a copyable block for code reviews, documentation, API tests, classwork or troubleshooting notes.
What the result means
Rows are compared by their complete cell values, so exact duplicate records are removed and first occurrences are kept.
What is not included
No fuzzy matching is performed. Whitespace and capitalization differences count as different rows.
Privacy note
The calculation runs in your browser. Avoid pasting production secrets, credentials, private keys, customer data or regulated personal data unless your own policy allows browser-based tools.