CSV Prepend Column (Add at Front)

Insert a new column at the very beginning (leftmost position) of a CSV table with a default value.

How It Works & Processing Standards

Insert a new column at the very beginning (leftmost position) of a CSV table with a default value.

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 Prepend Column (Add at Front) 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 Prepend Column (Add at Front)

  1. 1
    Paste CSVEnter your CSV table.
  2. 2
    Configure ColumnSpecify header label and default value to populate in each row.
  3. 3
    Export TableCopy or download the modified CSV.

Examples

Prepend Status Column
Input: name,email Alice,alice@example.com
Result: Prepend [status="active"]: status,name,email active,Alice,alice@example.com

Common Use Cases

  • Adding fixed batch identifiers or source system tags to incoming CSV dumps
  • Inserting constant status codes before importing into relational tables
  • Adding an empty or placeholder column at the start of a spreadsheet

Frequently Asked Questions (FAQ)

Can the prepended value be left blank?

Yes, leave the default value empty to create an empty leading column.

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