Add Line Numbers

Add incremental numbers to every line.

Runs locallyNo signupMobile readyCopyableFree

①Add Line Numbers

All processing happens locally

Input text

Start

Step

Separator

Output

Add Line Numbers is a batch line numbering tool, processing happens locally in your browser with no upload.

Numbering test cases, requirement lists or name rosters by hand invites off-by-one errors. Automated numbering is instant and format-aware.

Paste or type your content into the input field at the top, or press the sample button to load demo data.
Adjust the options below the input, such as output format, separators, letter case or precision.
Press the main button to run the conversion. Results appear instantly in the output panel without a page reload.
When the result looks right, use the copy button in the corner, or download it as a local file.

Clean up stray spaces and line breaks before pasting for more accurate results.

Can I number only some lines?+

Remove the lines you do not want first, or isolate the target block into its own paragraph.

Is the number format customisable?+

Yes. Prefix, suffix and separator are configurable, producing forms like 1. 2. 3. or [1] [2].

Is Add Line Numbers free to use?+

Yes. The tool is completely free with no usage limits, and you never need an account or a sign-in.

Is the text I enter uploaded anywhere?+

No. All processing runs locally in your browser, so the input never reaches a server and is never logged or stored.

Does Add Line Numbers work on a phone or tablet?+

Yes. The layout is mobile-first, so inputs and buttons stay comfortable on phones and tablets in both orientations.

Can I copy the result into my own document?+

Yes. A copy button in the output panel puts the result on your clipboard, and you can also download it as a text file.