CSV Column Renamer

A CSV column renamer lets you standardize header names without opening a spreadsheet or editing a file by hand. Paste your CSV, define a simple old_name=new_name mapping, and the tool returns a new CSV with the updated header row while leaving the data rows untouched.

Why it is useful

Renaming columns is a common cleanup step before importing data into another app, combining exports from different sources, or preparing a file for scripts and dashboards. You might turn fname into first_name, align CRM exports to your internal schema, or replace inconsistent labels before sharing data with teammates.

How this tool works

The mapper only changes the headers you specify. Columns not listed stay exactly as they are, which makes it easy to update just a few names without rebuilding the file structure. Because everything runs in the browser, you can make quick schema adjustments without uploading sensitive CSV content anywhere.

If you regularly receive CSV files with mismatched or messy column names, this tool gives you a fast way to normalize them before the next step in your workflow.