Free Online Tool
Number Lines
Add sequential numbers to the start of every line.
The Number Lines lets you add sequential numbers to the start of every line. Paste your text below and the converted result appears immediately — no waiting, no upload, and nothing saved anywhere.
How to use the Number Lines
- Paste your original text into the input box.
- Choose any conversion options offered above.
- Copy the converted result, or download it as a .txt file.
- Use Clear to start over with new text.
Key features
- Converts instantly as you type, with no delay.
- 100% private — your text stays in your browser.
- Free to use, with no sign-up and no daily limit.
- Handles both short snippets and long documents well.
Questions
Frequently asked questions
Is the Number Lines free to use?
Yes — the Number Lines is completely free, with no sign-up, no trial period, and no hidden limits.
Is my text uploaded anywhere when I use the Number Lines?
No. The Number Lines runs entirely in your browser using JavaScript. Your text is processed on your own device and is never sent to a server.
Can I use the Number Lines on my phone?
Yes. The Number Lines works in any modern browser, including on mobile devices, with no app to install.
Is there a limit to how much text I can use?
There's no artificial limit. Because everything runs in your browser rather than on a server, the Number Lines can generally handle as much text as your device can comfortably process.
Keep going
Related tools
Split Text into Lines
Split delimiter-separated text into one item per line.
Merge Lines
Merge multiple lines into a single line with a separator you choose.
Remove Line Numbers
Strip a leading number or bullet pattern from every line.
Alternate Line Remover
Keep only odd or only even lines, removing every other line.
Handy to know
Popular tools
Explore the rest of the toolbox
111 free browser-based text tools — no sign-up, nothing ever uploaded.
View all tools