Data & CSV

Rename CSV columns

Apply an explicit heading map while preserving cell contents.

Your inputs

Your CSV data

UTF-8 CSV/TSV stays on this device. First row contains unique headings; maximum 25 MB, 50,000 rows and 200 columns. Fully empty rows are ignored.

Up to 25 MB per file, 50,000 data rows, 200 columns and 2 million data cells. Fully blank rows and columns are ignored before row, column and cell limits are checked. Individual tools may have smaller result or chart limits.

Or choose a CSV file

Column separator

Rename map CSV: Old,New

UTF-8 CSV/TSV stays on this device. First row contains unique headings; maximum 25 MB, 50,000 rows and 200 columns. Fully empty rows are ignored.

Or choose a CSV file

Results update as you type. Larger files run when you press Update result.

Processed on your device

Your result

LOCAL & PRIVATE

Your result will appear here.

Your inputs stay in this browser. Nothing is uploaded or saved.

A clear answer. Here’s how.

Applies the Old→New map simultaneously, allowing swaps such as A→B and B→A. Source headings must exist, each Old heading appears once, and final headings must be unique and non-empty. The mapping table uses comma-separated CSV (TSV uploads are converted locally). Data values and column order are preserved.

See a worked example

Worked example

A fixed demonstration, separate from the values you enter above.

Your CSV data

ID,Name,Department,Amount,Date
001,Ada,Design,120,2026-01-05
002,Sam,Writing,80,2026-01-06
003,Jo,Design,150,2026-01-07
004,Lee,Writing,,2026-01-08
005,Alex,Design,60,2026-01-09

Column separator

Comma

Rename map CSV: Old,New

Old,New
Department,Team
Amount,Revenue

Example result

Example result
ID	Name	Team	Revenue	Date
001	Ada	Design	120	2026-01-05
002	Sam	Writing	80	2026-01-06
003	Jo	Design	150	2026-01-07
004	Lee	Writing		2026-01-08
005	Alex	Design	60	2026-01-09