Add Line Numbers
Add line numbers to any text with customizable start number, separator style, and zero-padding. Supports code snippets, legal documents, academic papers, and more.
How do I use this line numbering tool?
Simply paste your text into the input area, configure the options (starting number, separator style, padding), and the numbered output appears instantly in the output area. You can then copy it with one click.
What separator styles are available?
You can choose from Tab, Space, Dot-Space (e.g., "1. "), Bracket (e.g., "[1] "), Parenthesis (e.g., "(1) "), or a custom separator you define yourself.
What is padding and how does it work?
Padding adds leading zeros to line numbers so they all have the same width. For example, with padding set to 3, line 5 becomes "005". This is useful for keeping text aligned when you have many lines.
Can I start numbering from a number other than 1?
Yes, you can set any starting number from 0 to 9999. This is useful when you need to continue numbering from a previous section or document.
Is my text data sent to a server?
No. All processing happens entirely in your browser using JavaScript. Your text never leaves your device, ensuring complete privacy and security.
Is this tool free to use?
Yes, this line numbering tool is completely free. No registration, no subscription, no hidden fees. Use it as many times as you need.
What are common use cases for adding line numbers?
Line numbers are commonly used in code snippets for reference, legal documents for precise citation, academic papers for peer review, poetry analysis, debugging logs, and data entries.
Can I use this tool on mobile devices?
Yes, the tool is fully responsive and works on smartphones and tablets. The interface adapts to your screen size for comfortable use on any device.
How do I copy the numbered output?
Click the "Copy" button next to the output area to copy all numbered text to your clipboard. You can then paste it into any application.
What is line numbering and why is it useful?
Line numbering is the process of adding sequential numbers to each line of text. It helps with referencing specific lines, collaboration, debugging, and maintaining structure in documents.
Can I skip empty lines when numbering?
The current version numbers every line including empty ones. If you need to skip empty lines, you can remove them from your input text before numbering.
Does this tool support Unicode and special characters?
Yes, the tool handles all Unicode characters including CJK (Chinese, Japanese, Korean), Arabic, Cyrillic, emoji, and special symbols without any issues.
How to Use Add Line Numbers
Add line numbers to any text right in your browser — your text never leaves the device. Choose the starting number, separator style, and zero padding, then copy the result.
- Paste your text into the box that says 'Paste your text here...'.
- Enter the first number in the 'Start at:' field — use 1 for most documents.
- Choose a separator from the dropdown: 'Tab', 'Space', '. (dot-space)', '[n]' or '(n)', or pick 'Custom' and type your own into the 'Custom:' field.
- Set 'Padding:' if you want zero-padded numbers such as 001 and 002.
- Copy the numbered text from the output area.
Zero padding keeps lists aligned — with 'Padding:' set, 2, 10, and 100 line up neatly in monospace fonts.
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