How to Use Add Line Numbers
Add sequential line numbers to text with a configurable starting number, separator style and zero-padding.
Open the Add Line Numbers tool →What is Add Line Numbers?
Prefix every line with a number, with custom start, separator and padding. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Add Line Numbers
- Open the Add Line Numbers tool.
- Paste or type your input.
- Set any options provided.
- Copy the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
Can I customise the numbering?
Yes — set the starting number, the separator between the number and the text, and zero-padding width.
What can I use it for?
Preparing numbered lists, referencing lines in code reviews, or creating ordered steps from plain text.
Is my text uploaded?
No — numbering is added locally in your browser.
Ready to try it?
Open Add Line Numbers →