Is my table data uploaded to a server?
No. The tool parses, transforms, previews, and exports data locally in your browser without uploading your input.
Data & Tables
Column Renamer
Rename table columns online. Clean headers, resolve duplicate names, and prepare export fields locally in your browser.
Tool
Column Renamer
Rename table columns online. Clean headers, resolve duplicate names, and prepare export fields locally in your browser.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this Column Renamer to fix headers without changing row values. The tool edits column labels, generate machine-friendly keys, detect duplicate names, trim extra spaces, and preview how renamed fields will appear in CSV, JSON, Markdown, or HTML output. It is focused on header cleanup rather than full table editing.
Examples
- First Name , E-mail Address , Signup Date Ada,ada [at] example.com,2026-01-12 Ben,ben [at] example.com,2026-01-13
Frequently Asked Questions
Can duplicate column names be detected?
Yes. Duplicate names are flagged because they can overwrite values in object-based exports.
Can names be converted into safe keys?
Yes. The tool can suggest clean keys using lowercase text, separators, and valid characters while preserving readable labels separately.
Does renaming change cell values?
No. Only column labels or keys should change.
What file sizes are practical in the browser?
Small and medium tables are the best fit. Very large files can use a lot of memory because parsing, previews, and exported results all live inside the browser tab.
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