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Add Line Numbers

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About Add Line Numbers

The Number Lines tool adds sequential numbers to every line of your text instantly. Choose a starting number, select a numbering format, and generate a numbered list with a single click.

You can start numbering from 0, 1, or any custom value. The tool also supports different separators, including periods, dashes, colons, parentheses, and spaces. This makes it easy to match the format required by your document or workflow.

Numbered lists are useful for instructions, technical documentation, legal documents, reports, outlines, code reviews, and academic content. Adding line numbers manually can take time and lead to mistakes. This tool automates the process and produces consistent results.

The tool can also help when renumbering an existing list. Simply remove the old numbers, choose a new starting value, and generate a fresh sequence instantly.

Everything runs locally in your browser. Your data never leaves your device, and no account, login, or installation is required.

How to Use Add Line Numbers

  1. Paste your list — one item per line.

  2. Set the start number (default: 1).

  3. Choose a separator format: period (1.), dash (1-), colon (1:), or parenthesis (1)).

  4. Copy the numbered output.

Examples

Example — Standard numbered list
Input
Introduction
Background
Methodology
Results
Conclusion
Output
1. Introduction
2. Background
3. Methodology
4. Results
5. Conclusion
Example — Start from 0
Input
Index zero
Index one
Index two
Output
0. Index zero
1. Index one
2. Index two
Example — Parenthesis format
Input
First step
Second step
Third step
Output
1) First step
2) Second step
3) Third step

Frequently Asked Questions

Can I start numbering from 0?

Yes — set the start number to 0 and numbering will begin from 0, 1, 2, 3...

Can I start numbering from a number other than 1?

Yes — enter any starting value. If you have a list that continues from item 47, set the start to 47.

What separator formats are available?

Period (1.), dash (1-), colon (1:), right parenthesis (1)), and plain space (1 ). You can also enter a custom separator.

Can I renumber an existing numbered list?

First use Find & Replace to remove the existing numbers, then use this tool to add new sequential numbers starting from your desired value.

Does it work for legal document numbering?

Yes — choose a period separator (1.) and set your starting number. For nested lists, apply the tool to each section separately.

Can I add numbers with leading zeros?

Not natively, but you can add a custom prefix in the Prefix field of the Add Prefix/Suffix tool after numbering, using Find & Replace to pad single digits.