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Add Line Numbers

Add line numbers to text. Number each line. For code and documents. Free online text tool — process content instantly in your browser with no upload or signup

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Reference & details

How it works

Text Operation Scope

The Add Line Numbers applies its named operation to text entered or imported here. Review the options shown and the resulting text before using it elsewhere.

Input and Processing Rules

Case, whitespace, line endings, locale, and Unicode handling vary by operation. Behavior follows the controls shown on this page and any tool-specific notes.

Output Review

Inspect the result and any relevant delimiters, whitespace, or line breaks before using it in another document or system.

Updated: September 2026

Example Scenarios

A writer runs a short, non-sensitive excerpt through the Add Line Numbers and checks that the visible result addresses the task before using it in a draft.

An editor tries the Add Line Numbers on a copy of the text, then reviews the displayed result and relevant source details before sharing it.

A developer checks a representative snippet with the Add Line Numbers, then validates the result in the editor or system where it will be used.

FAQ

The core operation runs in this browser. Some features also save preferences or history locally or request an external URL you enter. Review feature-specific notes, and avoid credentials or secrets.

Yes, it's completely free with no registration required. Use the Add Line Numbers as often as you need with no limits, accounts, or subscriptions.

This page must load before use. In-page actions may work offline, but features that request external pages require a network connection; behavior depends on the tool's resources.

The tool works in all modern browsers including Chrome, Firefox, Safari, and Edge. No plugins or extensions are required.

Yes. Use the copy button or select the output text directly. Results are ready to paste into code editors, documents, or other apps.

About Add Line Numbers

Use our free Add Line Numbers for fast, accurate results in your browser. No signup or installation required — works on any device.