How do I rename CSV header names?

Upload or paste your CSV and each header appears as an editable input. Type a new name and the output CSV on the right updates instantly. You can also reorder columns with the up/down buttons or remove the ones you don't need.

Can I add a header row to a CSV that has none?

Yes. Use the promote button to turn the first data row into the header row. You can also do the reverse — demote the current header back into a data row to get a header-less CSV again.

Can I add, remove, or reorder columns?

Yes. The “add column” button appends an empty column, the remove button on each row drops a column, and the up/down buttons reorder a header together with its matching column.

How do I save the edited CSV?

Copy it in one click from the output box, or use the “Download” button to save it as header.csv. Quoting and escaping are handled correctly.

No. Everything runs entirely in your browser. Your CSV is never uploaded or stored on a server.

Yes, it is completely free. No sign-up and no installation required.

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CSV header editor

CSV tools

Rename, add, remove, or reorder CSV headers, promote the first row to a header, then download the result. Everything runs in your browser; your data is not uploaded.

What is this CSV header editor?

A free, browser-based tool to edit the header row of a CSV. Upload or paste a CSV, then rename, add, remove, or reorder header names. If your file has no header row, promote the first data row to become the header — or demote the header back into a data row. Get a clean CSV to copy or download. Everything runs locally in your browser, so your data is never uploaded.

How to use it

Upload a CSV file or paste it into the box on the left.
Edit the header names in the inputs on the right; reorder or remove columns as needed.
Add a column, or promote the first row to a header (or demote the header to a row).
Copy the result or download the edited CSV.

Common use cases

Renaming export headers to match the field names another tool expects on import.
Adding a header row to a header-less CSV, or fixing one parsed from the wrong row.
Tidying up column names before importing a contact or lead list into a CRM.

Related CSV tools

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Operated by

Tools by Timothe AI is a suite of free tools built and operated by unbounded pioneering inc, the company behind Timothe AI.

Ryosuke SuzukiFounder & CEO

Founder & CEO of Unbounded Pioneering Inc., the company behind Timothe AI, and an expert in machine learning and AI product development. He began his career in machine learning research at a university laboratory, then designed and built large-scale products as a software engineer at PLAID, Rakuten, and Recruit, while also driving new business development. Now specializing in generative AI and AI products, he works across both engineering and business development, and is a named inventor on multiple granted patents in web technology.

Named inventor on granted patents JP6887648 & JP7480958 · Patent pending on Timothe AI technology

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