CSV Deduplicator & Unique Rows

Remove duplicate rows from a CSV by full-row comparison or by a subset of key columns — choose which columns form the key (or use the whole row), with optional case-insensitive matching and whitespace trimming. Outputs the unique rows, with a count of duplicates removed. Auto-sniffs the delimiter (comma, semicolon, tab, pipe), handles quoted fields, and outputs to the delimiter of your choice. Everything runs locally in your browser.