Line Number Adder

Add sequential line numbers to any block of text.

How to Use Line Number Adder

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Line Number Adder — Free Text Utility

Line Number Adder prepends a sequential number to every line of your text, with a customizable starting number and separator style — useful for creating numbered lists from plain text, preparing code snippets for documentation or tutorials where line references matter, or numbering items in a script or dataset for easy reference during review. Rather than manually typing "1. ", "2. ", "3. " in front of every line, paste your text once and get consistently numbered output instantly, with control over whether numbering starts at 0 or 1 and what separator (period, colon, parenthesis) follows each number.

Keywords and Search Terms

People searching for this tool use terms like: add line numbers, line numbering tool, number text lines online, line numberer, numbered list generator. Tooliby provides this utility free with no signup, no watermarks, and no data logging.

Privacy — Your Data is Never Stored

Every input you paste into Tooliby text tools is processed in memory and immediately discarded. We do not log inputs, store results, or analyze your data.

Frequently Asked Questions

Yes — set any starting number, including 0, useful when the numbering needs to match a zero-indexed system like most programming array indices.

Common choices are period-space ('1. '), colon-space ('1: '), or a simple space — any custom separator string can be used.

Yes, it's commonly used to add reference line numbers to code before pasting into documentation or a tutorial, making it easy to say 'see line 12'.

Yes, every line including blank ones receives a number, keeping the numbering sequence consistent with the original line count.