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Add Line Numbers

Start at:Separator:
Input
1
→
Output1 lines
1
1.

3 min readUpdated

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.

Add Line Numbers Features

  • Runs entirely in your browser

    Add Line Numbers processes everything client-side — nothing you paste, type, or upload is sent to a server.

  • Free, instant, no sign-up

    No account, no usage limits, no paywall. Results update as you type or click.

  • Prefix every line with a sequential number instantly

    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.

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
Example — Number legal clauses
Input
The tenant shall pay rent monthly.
The landlord shall maintain the property.
Either party may terminate with 30 days notice.
Output
1. The tenant shall pay rent monthly.
2. The landlord shall maintain the property.
3. Either party may terminate with 30 days notice.
Example — Number a QA checklist
Input
Verify login with valid credentials
Verify login with invalid credentials
Verify password reset flow
Output
1. Verify login with valid credentials
2. Verify login with invalid credentials
3. Verify password reset flow
Example — Number survey questions
Input
What is your age range?
How did you hear about us?
Would you recommend us to a friend?
Output
1. What is your age range?
2. How did you hear about us?
3. Would you recommend us to a friend?

Practical Uses for Add Line Numbers

  • Number the steps in a technical how-to guide
  • Add reference numbers to legal document clauses
  • Number survey questions before printing a form
  • Add row numbers to a code review checklist
  • Number citations for a bibliography or footnote list
  • Add sequence numbers to test cases in a QA checklist

Who Uses the Add Line Numbers Tool

  • Technical writers add consistent step numbers to how-to guides and onboarding docs.
  • Legal and compliance teams number clauses and sub-clauses in contracts and policy documents.
  • QA engineers number test cases and checklist items for easy reference during test runs.
  • Teachers number exam or worksheet questions before printing or distributing them.
  • Project managers number action items or meeting notes for easy reference in follow-ups.

Comparisons

Add Line Numbers vs Text Repeater

These two tools both add structure to a list, but for different purposes. Add Line Numbers prefixes each existing line with a sequential number, turning a plain list into a numbered outline, checklist, or legal clause set — the content itself doesn't change, only the numbering added in front of it.

Text Repeater instead duplicates the content itself a set number of times, which is useful for generating test data or repeated template rows rather than numbering an existing list. If you need both — repeated rows and sequential numbers — run Text Repeater first, then Add Line Numbers.

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.

Can I number a legal contract's clauses?

Yes — paste each clause on its own line, choose the period format (1., 2., 3.), and set your starting number to match where your document's numbering should begin.

Can I use this for a QA test case checklist?

Yes — paste your test case descriptions one per line and number them for easy reference during test execution and bug reporting.

Does it support Roman numerals or letters instead of numbers?

Not natively — this tool generates sequential Arabic numbers only. For Roman numerals, generate the numbered list here first, then convert the numbers using the Roman Numerals Converter tool.

Ready to use Add Line Numbers?

It's free, runs entirely in your browser, and there's nothing to install or sign up for.

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