Tool Workspace
Enter content, process with one click
1Introduction
Add Line Numbers is a simple, practical text processing tool. Paste text into the input box and add a number to every line with one click. You can freely set the starting number and step - for example start at 5 and increase by 2 each time - and the result supports one-click copying for direct use. The tool is intuitive to use, no registration or installation needed - open the page and processing is done. Both code snippets and ordinary lists keep their original content, with only a line-number prefix added, keeping the format clean and tidy. Everything runs locally in the browser with fast processing, never disturbing the original text structure. It suits adding line numbers to code for discussion and debugging, and is often used to organize logs, generate lists, or mark key points. For programmers, writers, and office workers, this small tool removes the hassle of manual numbering, making reading and sharing information more efficient.
2How to Use
Paste text
Paste the text you want to number into the input box. Multi-line content is supported.
Set the numbering parameters
Enter the starting line number and step, for example start at 5 and increase by 2 each time.
Start numbering
After clicking the button, the system automatically adds a line-number prefix to every line.
Copy the result
Once generated, click the copy button to use the numbered text.
3FAQ
How to add line numbers to text?
Simply paste the text into the input box, set the starting line number and step (default starts at 1, increment by 1), and click the 'Add Line Numbers' button to automatically add line numbers before each line. Supports custom line number formats such as '1: ' or '[1]'.
How to copy the result after adding line numbers?
After adding line numbers, the result is displayed in the output area. Click the 'Copy' button to copy all content at once. You can also manually select and copy the text for convenience.
