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CSV Cleaner and Deduplicator

Clean tabular files without turning identifiers into numbers.

This calculator runs in your browser. Nothing is sent to a server.

CSV / TSV

Cells stay strings. 00123 is not coerced to 123.

Delimiter

Trim fieldsTrim fields

Duplicate key columns

none, a header name, comma-separated names, or * for the whole row.

Empty rows

Output encoding

Spreadsheet formula safety

How it works

Processing stays in this browser tab. Source files are not uploaded. Export is a new copy; originals are not overwritten.