Free Online Duplicate Row Remover

1. Paste CSV with a header row into the input box.
2. Choose Whole row to remove exact duplicates, or pick a key column.
3. Read the count of removed rows to confirm the result.
4. Copy the deduplicated CSV from the output box.
5. Normalize case or whitespace beforehand if you need looser matching.

De-duplicating a table is a row-level operation, not a line-level one. This tool parses CSV (per RFC 4180) and drops repeated rows, keeping the first occurrence in document order so the surviving rows retain their original sequence. It reports how many rows it removed so you can sanity-check the result.

The key choice is what counts as a duplicate. Match on the whole row to remove only exact copies where every field is identical. Or match on a single key column — for example, keep one row per email address or one per order ID — which collapses records that share that key even if other columns differ. That single-column keying is the part generic line-dedup tools cannot do, and it is the common real-world need when cleaning a contact list or a transaction log.

Matching is case-sensitive, so "Alice" and "alice" are treated as distinct; normalize your data first if you need looser matching. This is the tabular companion to the text remove-duplicates tool, which dedupes raw lines instead of structured rows. Everything runs locally in your browser.