Add Line Numbers
Add line numbers to each line of your text.
🔢 Adds line numbers to each line. Useful for code review, transcripts, and references.
What Is This Tool?
This tool adds line numbers to each line of your text, formatted with right-aligned numbers and consistent spacing. Useful for code review, transcripts, and any text you need to reference by line.
Common Uses
- Code review — reference "line 42 has a bug"
- Transcripts and interview notes
- Log file analysis
- Document review and editing
- Educational materials and tutorials
Frequently Asked Questions
Why right-aligned numbers?
Right alignment keeps the text column stable as line counts grow — line 9 and line 10 have the same starting position. This is the convention in code editors and print publications.
About the Add Line Numbers
The Add Line Numbers handles add line numbersdirectly in your browser. Paste or type your input, and the tool processes it instantly — no upload, no signup, no waiting. It's built for the moments when you need a quick transformation and don't want to leave your workflow.
Because the tool runs client-side, it's fast and private. Your text never touches a server, which makes it safe for sensitive content. The interface is keyboard-friendly and works on any device with a modern browser.
How to Use This Tool
- Paste or type your input into the text area.
- Adjust any options the tool offers.
- The output updates automatically as you type or change options.
- Copy the result using the copy button.
Why Use an Online Tool?
Browser-based tools like this one have a few real advantages over installed software or manual methods:
- No installation. It opens instantly in any browser, on any operating system.
- Private by default. Everything runs locally, so your data stays on your device.
- Always up to date.There's nothing to update — you always get the latest version when you load the page.
- Free and unlimited. Use it as often as you like, with no account and no caps.
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