Add Line Numbers — Free Online Tool

Prefix every line with sequential line numbers. Add Line Numbers is a free online tool from the ToolsRift Text Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.

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How to use Add Line Numbers

  1. Open the Add Line Numbers above — it loads instantly, no account needed.
  2. Enter or upload your input. Everything is processed locally on your device.
  3. Get your result immediately and copy or download it with one click.

Frequently asked questions

What number format options are there?

You can choose '1.', '1:', '(1)', or custom prefix/suffix formats.

Can I start from a number other than 1?

Yes — set any starting number for the sequence.

Does it skip empty lines?

Optional — you can skip numbering blank lines.

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