What can I do with Add Column to CSV?

Append a new column with a constant or sequential value. Add Column to CSV is part of the Data shelf on utils.sbs and is designed for quick, one-off tasks.

Is Add Column to CSV free to use?

Yes. Add Column to CSV is free, requires no account, and has no per-file or per-use charge.

Are my files uploaded when I use Add Column to CSV?

No. Add Column to CSV is designed to process your input locally in the browser. Files are not uploaded to a server for processing.

What formats does Add Column to CSV support?

It works with CSV, TSV, JSON and plain-text tables, and returns a downloadable data file.

Can I use Add Column to CSV on my phone?

Yes. Add Column to CSV is responsive and works in modern mobile browsers. Very large files may be limited by the device's available memory.

Data tool

Add Column to CSV

Append a new column with a constant or sequential value.

Runs on-deviceNo sign-upFree

All data tools

Workspace

Add Column to CSV

Runs locally

Input data5 lines

Or load a CSV / TSV file

or · local only

New column name

Value

Handles quoted fields

Commas, tabs and pipes are detected automatically. Download the result as a file or copy it straight into your app.

Result

The guide

By the utils.sbs team · Reviewed November 2026 · How we build and review tools

Quick answer

Add Column to CSV is a free browser-based data tool. Append a new column with a constant or sequential value. It runs with JavaScript locally, requires no account and does not upload your files. Open the page, add your input, adjust any options and download the result.

What is Add Column to CSV?

Add Column to CSV is a free browser-based data tool from utils.sbs. Append a new column with a constant or sequential value. It is built for quick, focused jobs: open the page, add your input, adjust the options and take the result with you. No account, install or server upload is required.

At a glance

Category	Data
Input	CSV, TSV, JSON or plain text
Output	A CSV, TSV, JSON or plain-text file
Engine	JavaScript
Processing	In your browser
Price	Free
Account	Not required

How Add Column to CSV works

The input is parsed with JavaScript and transformed in memory. No server round-trip is needed.

How to use Add Column to CSV

1Open Add Column to CSV and add your input.
2Adjust the options: new column name, value.
3Run the tool, check the preview or result, and download the output.

When to use Add Column to CSV

Clean up a CSV before importing it into another tool.
Convert between tabular formats such as CSV, TSV and JSON.
Inspect or reshape a dataset without a spreadsheet app.

Inputs and options

New column name: Set this value before running the tool.
Value: Set this value before running the tool.

Limitations

Malformed CSV, unusual delimiters or inconsistent columns may need cleanup before processing.

Privacy and accuracy

Add Column to CSV processes its input in the browser whenever the platform API allows it. Files and values are not uploaded to a server for processing, and the tool does not require an account. For calculations, use the result as a reference and verify important decisions against the source formula or a qualified professional. Read our methodology.

FAQ

Add Column to CSV questions

What can I do with Add Column to CSV?
Append a new column with a constant or sequential value. Add Column to CSV is part of the Data shelf on utils.sbs and is designed for quick, one-off tasks.
Is Add Column to CSV free to use?
Yes. Add Column to CSV is free, requires no account, and has no per-file or per-use charge.
Are my files uploaded when I use Add Column to CSV?
No. Add Column to CSV is designed to process your input locally in the browser. Files are not uploaded to a server for processing.
What formats does Add Column to CSV support?
It works with CSV, TSV, JSON and plain-text tables, and returns a downloadable data file.
Can I use Add Column to CSV on my phone?
Yes. Add Column to CSV is responsive and works in modern mobile browsers. Very large files may be limited by the device's available memory.

Keep going

Related data tools