Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.
Add Line Numbers
Add sequential line numbers to each line of text.
FreeRuns in browseradd line numbersnumber lines
0 chars
Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result
About Add Line Numbers
Add sequential line numbers to each line of text. Add line numbers to text online for free. Choose from multiple numbering formats including dot, colon, and zero-padded styles for code or documents. No signup needed. Handles Unicode text correctly, including emoji and multi-byte characters. Processes text instantly in your browser with no practical size limits. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.
Related tools: Sort Lines, Remove Empty Lines, Number Each Line
How to Use Add Line Numbers
- Paste or type your text into the input area.
- Select the transformation you want to apply.
- Copy the transformed result from the output area.
Frequently Asked Questions
What is Add Line Numbers?
Add line numbers to text online for free. Choose from multiple numbering formats including dot, colon, and zero-padded styles for code or documents. No signup needed.
Does the tool preserve formatting?
The tool preserves whitespace, line breaks, and structural formatting while applying the selected transformation. Only the targeted text characteristics are changed, leaving your overall layout intact.
Can I process large texts?
Yes, because all processing happens in your browser there are no server-imposed size limits. Performance remains fast for texts up to several hundred thousand characters on modern devices.
What character encodings are supported?
The tool handles Unicode text correctly, including emoji, accented characters, and multi-byte scripts such as Chinese, Japanese, and Arabic. Any text that your browser can display can be transformed.
Is Add Line Numbers free to use?
Yes, this text tool is entirely free. There is no signup, no account required, and no limit on how much text you can process.
Is my data safe when using Add Line Numbers?
Yes, all text processing happens locally in your browser. Your text is never sent to any server, so your content remains completely private and secure.