Add Line Numbers
Prefix each line.
▶ Open Add Line NumbersAdd Line Numbers is a free online text & writing tool that helps you prefix each line. Everything happens right in your browser, so it's fast, completely private, and free — no account, no installs, and no watermarks.
What is Add Line Numbers?
Add Line Numbers is built for anyone who needs to prefix each line without downloading software or signing up. Writers, students, marketers and developers all wrangle text daily — counting it, reformatting it, or cleaning messy copy. Add Line Numbers solves that in one click, right in your browser — and because the work happens on your own device, it's both instant and private.
How to use Add Line Numbers
- Click “Open Add Line Numbers” to launch the tool.
- Paste or type your text into the box.
- Pick your options or press the action button.
- Copy or download the result instantly.
Common uses
- Convert text between cases or encodings for a project.
- Check a piece of writing against a word or character limit.
- Clean up messy text pasted from PDFs or spreadsheets.
- Reformat a list — sort it, dedupe it, or renumber it.
Why use Somar's All Free Tools?
- Free forever — every feature, no hidden paywall or watermark.
- Private by design — processing happens on your device, not our servers.
- Instant — no queues, no waiting, no upload time.
- Works everywhere — desktop, tablet and mobile, nothing to install.
- No signup — just open it and go.
Frequently asked questions
Is Add Line Numbers free to use?
Add Line Numbers is completely free. There are no limits, no watermarks on your results, and no sign-up required.
Is my data private and safe?
Yes. Everything runs locally in your browser, so the data you enter never leaves your device.
Do I need to install anything or create an account?
No. Add Line Numbers works instantly in any modern browser on desktop, tablet or mobile — nothing to download and no account needed.
Is there a limit on how much I can process?
There's no practical limit — Add Line Numbers handles your text in the browser, so even large inputs are processed quickly.