Add Line Numbers

About Add Line Numbers

Add Line Numbers is a free online tool. Prefix every line of text with a sequential number for code review, scripts and citations. It runs entirely in your browser, so there is nothing to install, no account to create and no watermark added to your result.

How to use Add Line Numbers

1. Type or paste your text into the input box.
2. Pick any options that appear, then run the tool or watch the live result.
3. Copy the output with the copy button.

Worked example

Enter a short sample first to see how Add Line Numbers behaves, check the result, then run your real content.

Tips for best results

• Numbering is added to the output only; copy the result rather than editing the original.
• Everything runs in your browser, so you can use Add Line Numbers even on a slow connection once the page has loaded.

Limits to keep in mind

• Results depend on the input you provide. Review the output before you use it somewhere important.

Frequently asked questions