Add line numbers to each line of text. Customize the numbering format, separator, and starting number.
How to Use
- 1 Paste your text into the input field
- 2 The tool will prepend line numbers to text
- 3 Copy the result or download it
Why Use This Tool
Private & Secure
Your data never leaves your device. Everything is processed right in your browser — nothing is uploaded or stored on any server.
Lightning Fast
No waiting for uploads or server processing. Results appear instantly because all the work happens on your machine.
Free, No Sign-Up
Use this tool as many times as you want. No account required, no email, no limits — just open and go.
Frequently Asked Questions
Is Add Line Numbers free to use?
Yes, Add Line Numbers is completely free with no usage limits, no account required, and no ads. You can use it as many times as you need.
Is my data safe when using Add Line Numbers?
Absolutely. Add Line Numbers runs entirely in your browser. Your files and data are never uploaded to any server — everything is processed locally on your device.
Is there a character or text length limit for Add Line Numbers?
There is no hard limit. Add Line Numbers can handle very long texts, though extremely large inputs (millions of characters) may slow down depending on your device.
Can I use Add Line Numbers on my phone?
Yes, Add Line Numbers works on any device with a modern browser — including phones and tablets. The interface adapts to your screen size automatically.