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Add Line Numbers

Add line numbers to any block of text with the free online line numbering tool. It prepends sequential numbers to every line instantly, so code, quotes and lists are easy to reference.

Input

Result

What is Add Line Numbers?

Adding line numbers places a sequential number at the start of every line: the first line becomes 1, the second 2, and so on. It is a small transformation with outsized value. In a code review, line numbers give everyone an exact point of reference — “look at line 23” is far more useful than “about halfway down”. In legal or academic workflows, numbered paragraphs let you cite a specific line of a contract, transcript or quotation. In long lists and step-by-step guides, numbering makes the order explicit and lets a reader jump back to a known position. The tool splits your text into lines, counts them, prepends the number with a separator and rejoins them, preserving your content exactly. Because it runs in the browser, nothing is uploaded or stored, so you can safely number sensitive or confidential material.

How to use Add Line Numbers

Paste or type the text you want to number into the input box.
Click “Add Line Numbers” to prepend 1, 2, 3… to each line.
Copy the numbered result from the output box and use it wherever you need a reference.

Example

Input: alpha beta gamma Output: 1. alpha 2. beta 3. gamma Every line is prefixed with its position starting from 1. Blank lines receive a number too, so the count matches the original line count.

Common use cases

Pointing to a specific line during a code review or a bug discussion.
Numbering a transcript, contract or legal reference so citations are precise.
Numbering a long list, glossary or step-by-step procedure to keep order clear.
Annotating log files or output where a line reference makes errors easier to locate.

Pro tips

Number a copy of your code, not the working file, so the numbers never reach production.
Remove empty lines first if you only want to number the real content lines.
For documentation, choose a separator that reads naturally, like a period or a closing bracket.

FAQ

How does the numbering work?

Each line is prefixed with its position starting from 1: the first line becomes 1, the second 2, and so on.

Can I use it for my own files?

Yes. It is ideal for code, lists, quotes, transcripts and any text where referencing a line number is useful.

Do blank lines get a number?

Yes, every line receives a number, so the count matches the number of lines in your source.

What separator is used?

A period and a space, so the result reads as 1. , 2. , 3. and so on.

Is it free?

Yes, free and unlimited with no signup.

Is my text stored anywhere?

No. Everything runs in your browser and nothing is uploaded or stored.

Does it change my text?

No. It only prepends the number; your content is otherwise left exactly as written.

Can I number a whitespace-only line?

Yes, whitespace-only lines are numbered like any other line.