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Edit & Clean · browser workspace

Add Row Numbers to CSV - Auto Index Column

Add an auto-incrementing ID/index column to your CSV. processed locally in your browser.

Quick start

Built for add an auto-incrementing id/index column.

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: A new file or report produced locally in your browser.

  1. 1Choose a supported file or use sample data when available.
  2. 2Set the options shown for this workflow.
  3. 3Process the file locally, inspect the result, and download a new copy.
Preparing your private workspace…

How to Add Row Numbers

  1. 1Upload your CSV file
  2. 2Row numbers added
  3. 3Download with index column

Why Use This Tool?

  • ✓Auto Increment - 1, 2, 3...
  • ✓Custom Name - Name the column
  • ✓First Column - Added at start

Frequently Asked Questions

Where is the column added?

The row number column is added as the first column.