Which row is kept on a match?

The first occurrence — same order as appearance in the input.

CSV Deduplicate

Remove duplicate rows from a CSV. Dedupe on the full row, or just on selected key columns (e.g. dedupe by email).

Delimiter Header row

CSV input

Dedupe by (pick one or more columns; all selected = full-row dedupe)

Case-insensitive Trim values

Deduplicated output

How to use CSV Deduplicate

Paste CSV and pick the columns to dedupe by.
Toggle case-insensitive and trim if needed.
Click Deduplicate and copy the cleaned CSV.

What is CSV Deduplicate?

Picking specific columns deduplicates by their combined value — typical use case is keeping one record per email or one per customer ID even when other columns differ. Case-insensitive and trim options handle minor variations.

FAQ

Which row is kept on a match?: The first occurrence — same order as appearance in the input.

Related tools

CSV Filter
CSV Sort
Remove Duplicate Lines