Add Line Numbers to Text Online—Free Line Numbering Tool for Code & Documents
Instantly Add Line Numbers to Any Text Online
Our Add Line Numbers Tool is quick and easy to use. It numbers every line of text automatically. It's perfect for coding, editing, or making documents easier to read.
You can change how the numbers look and see the changes right away. And you don't need to download anything.
Key Features of the Online Line Numbering Tool
? Automatic Line Numbering for Any Text File
? Custom Start Number & Step Size
? Flexible Formatting (Prefix, Suffix, Separator)
? Supports Plain Text, Code, Logs, and More
? Live Preview and Instant Results
? 100% Browser-Based – No Upload Required
How the Line Numbering Tool Works
flowchart TD A [Paste or Upload Text] --> B[Choose Numbering Settings] B --> C[Apply Line Numbers] C --> D[Preview and Adjust] D --> E[Copy or Download Final Output]
The tool works right in your browser. It keeps your data safe and works fast.
Line Numbering Customization Options
Option
Description
Start Number
Define the first number (default is 1)
Step Increment
Choose how numbers increase (e.g., +1, +5)
Prefix/Suffix
Add characters before or after numbers
Separator
Decide what separates numbers from text (e.g., colon, tab, space)
Blank Line Skipping
Option to ignore numbering for empty lines
Use Cases for Adding Line Numbers
?? Source Code Review – Helps with debugging and reference in collaborative development
? Legal and Academic Texts – Allows referencing specific lines in long documents
? Manuscript Editing – Facilitates editorial discussions and feedback
? Log File Analysis – Improve readability and structure of system logs
? Technical Support – Share exact lines in documentation or FAQs
Advantages of Using Our Line Number Tool
✅ No Installation or Signup Required
Just visit the page, paste your text, and number it instantly.
? Privacy-Preserving
Everything happens in your browser. No uploads, no tracking.
?️ Customization for Every Scenario
Adjust line formatting to fit coding, academic, or publication rules.
?️ Works on All Devices
It works on desktops, tablets, and mobile phones.
Example Output (with default settings)
Input:
function greet(name) { return "Hello, " + name; } greet("World");
This tool supports plain text. Just paste or type your content into the input box.
? Can I skip numbering blank lines?
Yes, you can skip empty lines by enabling the "Skip Blank Lines" option.
? Can I use tabs or custom separators?
Yes, you can use spaces, tabs, colons, pipes, or any custom characters as a separator.
? Can I download the result?
Yes. After numbering, you can copy the output or save it to a .txt file using your browser’s “Save As” feature.
How to Use the Line Number Tool
Paste or enter your text into the input box.
Configure your preferences – start number, separator, skip blanks, etc.
Preview and verify the line numbers.
Copy or save the output for your project or document.
Conclusion—Number Text Lines Quickly and Precisely
Our Free Online Line Numbering Tool is great for coders, writers, editors, and analysts. It helps with JavaScript snippets, novel proofreading, or legal documents. Line numbers make your work clear and organized.
It's easy to use, with customizable settings and instant output. So, you can focus on your content, not formatting.
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