# Add Line Numbers

> Prefix every line with a sequential number, with a custom start, separator and zero padding.

To add line numbers, paste your text above and choose the starting number, the separator style and whether numbers should be zero-padded to equal width. Numbering is applied to every line including blank ones, so line positions stay accurate.

**URL:** https://convertto.tech/t/add-line-numbers
**Category:** Text Tools (https://convertto.tech/c/text-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Enter or paste your text.
2. Set the start at.
3. Choose the separator.
4. Turn "Pad with zeros" on or off as needed.
5. The result appears immediately — copy or download it.

## FAQ

### Why number lines in a document?

So people can refer to a specific place unambiguously. Legal contracts, code review, translation and proofreading all depend on being able to say "line 47" rather than describing where the text is.

### Should the numbers be part of the text?

Only if the text will be read as plain characters. In a word processor or code editor, numbering is a display setting that keeps the underlying text clean — baking numbers in makes the content impossible to copy or diff properly.

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