Add customizable line numbers (1., 001, [1]) to text, scripts, and code, or remove existing line numbers in real time.
Input Workspace
Characters: 88Words: 11Lines: 3Size: 88 Bytes
Output Result
Time: 0 msOutput: 0 Bytes
Tool Customization
1
100% Client-Side Privacy & Large-Text Ready
Supports text inputs up to 50 MB. Computations execute entirely within your local browser memory with zero server uploads.
Manipulators Guide
About the Line Numberer & Code Gutter Generator
Adding line numbers to code snippets, legal transcript citations, poetry manuscripts, or meeting notes makes referencing specific lines effortless during team reviews and presentations. Conversely, copying code from websites often includes unwanted line numbers that break compilers when pasted into code editors. The Line Numberer & Code Gutter Generator adds customizable line numbers (with padding, custom delimiters, and starting offsets) or strips existing line numbers from text and documents up to 50 MB in real time.
In-Depth Technical Guide
How Line Numberer & Code Gutter GeneratorWorks & What the Results Mean
Formatting Options for Line Numbering
The line numbering engine provides flexible formatting controls:
Starting Number Offset: Start numbering at any integer (e.g. starting at line 100 for a partial code snippet).
Zero Padding: Add leading zeros (e.g. 01, 02 or 001, 002) to maintain clean columnar visual alignment.
Custom Delimiters: Customize the separator between line number and text (e.g. 1. , 1: , [1] , 1 | , or Tab \t).
Skip Blank Lines: Number only content lines while leaving empty lines unnumbered, or number all physical lines.
Strip Line Numbers Mode: Automatically detects and removes existing line numbers and gutter prefixes (e.g. 1. , 001 | , [12]) when cleaning copied code.
Primary Everyday Applications
Code Review & Education: Adding line numbers to code samples for technical tutorials, lecture slides, and documentation.
Real-time processing handling text and code files up to 50 MB.
One-click copy and clean file download actions.
100% in-browser processing with complete data privacy.
Practical Scenarios
Examples & Real-World Use Cases
Adding Code Gutter Numbers to a Python Script
Scenario: Formatting a script for a tutorial slide with zero-padded line numbers.
Sample Input:
def calculate_total(items):
return sum(item.price for item in items)
Expected Output:
01 | def calculate_total(items):
02 | return sum(item.price for item in items)
Adds 2-digit zero-padded numbers with pipe delimiters.
Stripping Line Numbers from Copied Code
Scenario: Cleaning a code snippet copied from a blog with gutter numbers.
Sample Input:
1. import React from 'react';
2. export default function App() {
3. return <h1>Hello</h1>;
4. }
Expected Output:
import React from 'react';
export default function App() {
return <h1>Hello</h1>;
}
Strips numbered prefixes to restore executable code.
Common Questions
Frequently Asked Questions
Yes! Switch to 'Remove Line Numbers' mode. The tool automatically recognizes standard line numbers, dots, colons, and pipe prefixes and strips them cleanly.
