Rename CSV Columns
Change the name of CSV columns. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Rename CSV Columns
- 1. Paste CSV with a header row. Add the file to the input pane. The first line is treated as the header, and only that line is edited; every data row passes through unchanged.
- 2. List the renames. In the Renames box, write one mapping per line in old=new form, for example age=years. Columns you do not mention keep their current names, so you only list what changes.
- 3. Copy the relabeled CSV. The output is your data under its new header. Copy it into the importer, notebook or schema that demanded the different column names.
When to use Rename CSV Columns
Rename CSV Columns rewrites header labels using a simple old=new mapping while leaving the data untouched. Header mismatches are one of the most common reasons imports fail, and fixing them should not require opening a spreadsheet or writing pandas code.
- Matching an importer's required headers. Shopify, Mailchimp and most CRMs reject files whose headers deviate from their template. Map your export's names onto the required ones and the upload validates cleanly.
- Translating headers between systems. The upstream system calls it cust_nm while your warehouse schema says customer_name. A three-line rename mapping bridges the vocabulary without an ETL change request.
- Cleaning machine-generated labels. An export tool produced headers like field_0023 and col_final_v2. Renaming them to human words makes the file self-documenting before it circulates to the team.
- Preparing columns for a join. Two files hold the same key under different names, id in one and user_id in the other. Renaming one side lets your merge tool match the columns automatically.
Examples
Rename one column
Input
name,age Ada,36
Output
name,years Ada,36
About the Rename CSV Columns tool
Rename CSV Columns runs as plain JavaScript in your browser tab, with no server behind it. Change the name of CSV columns. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's CSV Tools section, 133 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with the Renames (one old=new per line) setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Rename CSV Columns cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.