📖 Read the full Add Line Numbers to Text guide — how it works, examples & FAQ →
How to use this tool
- Paste your lines.
- Get numbered output.
- Copy it.
Example
a / b → 1. a / 2. b
Why it's private
This tool runs entirely in your browser using JavaScript. Whatever you paste is processed on your own device — it is never uploaded to a server, logged, or stored. Built by Calabi, which also strips AI metadata and C2PA signals from images and video.