Can I start numbering from a number other than 1?

Yes. Set any starting number — start from 0 for zero-indexed code, from 100 to continue a previous numbering, or from any other value.

What separators are available?

Common separators include: colon (:), period (.), pipe (|), tab, and custom characters. Choose the separator that best fits your use case or house style.

Does it number empty lines?

Yes by default — empty lines receive a line number to preserve accurate line counts. An option to skip numbering empty lines is available.

Can I use this for code snippet sharing?

Yes. Add line numbers before sharing code in documents, emails, or discussion forums to allow precise references like 'the error is on line 23'.

What happens to existing line numbers?

The tool adds new line numbers to whatever text you paste — it doesn't detect or remove existing line numbers. If your text already has line numbers, remove them first using the Remove Line Breaks tool.

Text Utilities

Free

Add Line Numbers

Add line numbers to text with custom starting number and separator. Perfect for code or lists.

Input Text

Start number

Separator

What is Add Line Numbers?

The Add Line Numbers tool prepends sequential numbers to every line of your text or code, making it easy to reference specific lines in reviews, discussions, error logs, and documentation. It supports custom starting numbers, custom separators, and custom number formats.

Line numbers are essential when reviewing code, sharing text extracts for discussion, or referencing specific passages in long documents. Rather than manually counting and adding numbers, this tool adds them instantly in any format you need.

Why Use Add Line Numbers?

When collaborating on code reviews, discussing specific passages in documents, or debugging scripts, referring to 'line 47' is far more efficient than describing content. This tool adds line numbers to any text in seconds, enabling precise references without manual counting.

Key Features of Add Line Numbers

✓Adds sequential line numbers to all text lines
✓Customisable starting number (start at 0, 1, or any number)
✓Custom separator between number and text (colon, pipe, tab)
✓Option to pad numbers with leading zeros
✓Handles empty lines consistently

How to Use Add Line Numbers

1
Paste your text
Enter the text or code you want to number.
2
Set options
Choose starting number, separator style, and whether to pad numbers.
3
Add line numbers
Click 'Add Line Numbers' to number all lines.
4
Review the output
Verify the numbering looks correct and matches your needs.
5
Copy numbered text
Copy the numbered text for use in your review, documentation, or discussion.