Line Number Tool
Add line numbers to text or remove existing line numbers. Various format support.
Statistics
📝 What Is the Line Number Tool?
The Line Number tool is an online utility that automatically prepends sequential numbers to each line of your text. Whether you need to reference specific lines in a code snippet, annotate a document for peer review, or simply organize a list with numbered items, this tool handles it instantly. It also works in reverse, stripping existing line numbers from text so you can get clean, unnumbered content back. Everything runs directly in your browser with real-time results, no installation or sign-up required.
💡 Use Cases
- Code Reviews & Sharing — Add line numbers to code before pasting it into emails, chat messages, or tickets so reviewers can point to exact lines.
- Document Proofreading — Number the lines of drafts, essays, or contracts to give precise, line-level feedback during editing rounds.
- Education & Tutorials — Numbered example code or reading passages help students quickly locate the section being discussed.
- List Organization — Bulk-add sequential numbers to to-do items, inventory lists, or meeting agendas, or remove unwanted numbering in one click.
- Legal & Regulatory Documents — Many legal filings require line-numbered pages; this tool lets you prepare text before final formatting.
⚙️ Format Options
Set the first line number to any value you like. The default is 1, but you can start from 0 or any other number. This is especially handy when you are extracting a section from a larger document and want to preserve the original line references.
Choose the character placed between the number and the text. Six presets are available: period (.), colon (:), parenthesis ()), bracket (]), pipe (|), and tab. Pick whichever style best fits your formatting needs.
When enabled, shorter numbers are left-padded with spaces so all lines align neatly. For example, in a 100-line text, line 1 appears as " 1" to match the width of "100". This keeps code and structured text looking clean and easy to read.
Frequently Asked Questions
What line number formats can the removal mode detect?▼
It recognizes common patterns such as "1. text", "1: text", "1) text", and "1] text", including lines with leading whitespace. Most standard numbering styles are handled automatically.
Do blank lines receive a number?▼
Yes. Every line, including empty ones, is counted and numbered. This preserves the original structure of the text and ensures accurate line references.
Is there a maximum number of lines I can process?▼
There is no hard limit since the tool runs entirely in your browser. However, extremely large texts (tens of thousands of lines) may slow down processing. For typical use cases, performance is instant.