Add line numbers

Number each line with a starting value and a separator. Blank lines keep their place.

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Add line numbers processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Your text

Options

First number

After each number

Your result

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

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Updated 2026-09-19

Using Add line numbers

Number each line with a starting value and a separator. Blank lines keep their place.

Next: Duplicate line remover

A worked example

The add line numbers changes "a\nb" becomes "1. a\n2. b".

Next: Sort words alphabetically

Before you use the result

Line endings become standard newlines. A final newline is an empty final line.

Next: Text to columns

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ToolOctopus. “Add line numbers.” Updated 2026-09-19. https://tooloctopus.com/add-line-numbers.

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