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CSV Duplicate Remover

Remove duplicate rows from a CSV, matching on every column or just a key you choose.

Removing duplicates from a CSV means deciding what counts as a duplicate. Match on every column, or name a key such as email so rows are treated as the same record even when other fields differ. You can keep the first occurrence, the last, or drop every row that was duplicated at all.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Should I match on the whole row or a key?

A key, when one exists. Matching the whole row treats two records for the same customer as distinct if any field differs by a character — matching on email or ID finds the duplicates that actually matter.

How to use the csv duplicate remover

  1. 1Enter or paste your csv.
  2. 2Enter or paste your match on columns.
  3. 3Choose the delimiter.
  4. 4Choose the keep.
  5. 5Turn "First row is a header" on or off as needed.
  6. 6Turn "Case sensitive" on or off as needed.
  7. 7The result appears immediately — copy or download it.

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