What is the Add Line Numbers?
Prefix each line with a number. The Add Line Numbers is a free online tool that works instantly in your browser — no installation, no signup and nothing to upload. It sits alongside other Text tools on DevNibble such as Case Converter, Sort Lines, Remove Duplicate Lines.
How to use the Add Line Numbers
- Paste or type your input.
- The result appears instantly.
- Copy or download it.
Features
- Runs 100% in your browser — your data is never uploaded or stored.
- Free forever, with no account, no ads and no tracking.
- Copy or download your result in one click.
- Fast and responsive on desktop, tablet and mobile.
Frequently asked questions
Is the Add Line Numbers free to use?
Yes — Add Line Numbers is completely free with no sign-up, no ads and no limit on how many times you can use it.
Is my data private when I use the Add Line Numbers?
Everything happens locally in your browser. Your input is never sent to a server, which makes Add Line Numbers safe to use with private or sensitive data.
How do I use the Add Line Numbers?
Enter or paste your text and the result appears instantly. Copy or download it whenever you're ready.
Do I need to install anything to use the Add Line Numbers?
No installation and no account required — Add Line Numbers runs entirely in your web browser on desktop and mobile. Prefix each line with a number.