CSV Column Renamer

Rename header labels and column names in CSV and TSV tables.

How It Works & Processing Standards

Rename header labels and column names in CSV and TSV tables.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Desktop max file size: 50MB
  • Mobile max file size: 20MB

CSV Column Renamer is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use CSV Column Renamer

  1. 1
    Input CSVPaste your CSV table.
  2. 2
    Specify RenamesMap old column names to new header labels (e.g. old_name -> new_name).
  3. 3
    Export CSVCopy or download the CSV with updated column headers.

Examples

Rename Headers
Input: usr_nm,mail_addr Alice,alice@example.com
Result: username,email Alice,alice@example.com

Common Use Cases

  • Normalizing shorthand column codes into human-readable business titles
  • Converting snake_case or spaced column names to camelCase for API compatibility
  • Translating header names between languages

Frequently Asked Questions (FAQ)

Does renaming affect any data rows?

No, only the first header row is modified; all data records remain unchanged.

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