Add Line Numbers

Add line numbers to text. Customize start number, separator, and zero-padding. Free online line numbering tool.

Last updated: June 1, 2026

Start: Separator: Pad zeros

Input

With Line Numbers

What is Add Line Numbers?

A line number tool prepends sequential numbers to each line of text, creating numbered lists from plain text. This is essential for code review discussions (referencing specific lines), creating numbered instructions, preparing legal documents with line references, and any context where you need to reference specific lines by number. Options typically include customizing the starting number, separator character, and padding format.

How It Works

The tool splits your input on newline characters, then prepends each line with its sequential number followed by your chosen separator (period, colon, tab, or custom string). You can set the starting number, choose whether to pad numbers with leading zeros for alignment (e.g., 01, 02 ... 99), and optionally skip empty lines. The numbered output maintains all original line content and formatting while adding the line reference prefix.

Common Use Cases

•Preparing code snippets for review where team members reference specific line numbers
•Creating numbered step-by-step instructions from plain text notes
•Adding line references to legal documents, contracts, or regulatory filings
•Numbering paragraphs in academic papers for peer review reference
•Creating numbered lists from bullet-point content for clearer sequencing
•Preparing transcript text with line numbers for citation and reference purposes