Add Prefix Tool

Features

Add Prefix Tool is a simple and easy-to-use online text processing tool that helps you quickly add a uniform prefix to each line of multi-line text. Perfect for code comments, log processing, list formatting, and more. No login required, runs entirely in your local browser, your data will not be uploaded to any server.

Main Functions

1. Prefix Addition

Add custom prefix characters or strings to each line of text

2. Batch Processing

Process multiple lines of text at once, efficient and convenient

3. Real-time Preview

Input shows results instantly for easy adjustment

4. One-click Copy

Click to copy results to clipboard

How to Use

1. Enter or paste the text you want to process in the left input box
2. Enter the prefix you want to add in the "Prefix" input box
3. The processed result will be displayed on the right in real-time
4. Click the "Copy" button to copy the result to clipboard
5. Click the "Clear" button to clear all content

Examples

Basic Example:

Input:

const name = "John";
const age = 25;
const city = "New York";

Prefix: //

Output:

// const name = "John";
// const age = 25;
// const city = "New York";

Common Prefix Scenarios:

Scenario	Prefix	Purpose
JavaScript Comment	//	Code comment
Python Comment	#	Code comment
HTML List	-	Markdown list
Numbering	1.	Ordered list
Quote	"	Quote wrapper

Features

• Completely free, no registration required
• Processed in local browser, data secure
• Supports any prefix characters
• Real-time preview of results
• One-click copy results
• Cross-platform compatible

Use Cases

1. Code Comments: Add comment prefixes to code lines
2. Log Processing: Add timestamp prefixes to log entries
3. List Formatting: Add numbers or symbols to list items
4. Text Conversion: Add uniform prefixes to multi-line text
5. Batch Editing: Quickly process large amounts of text lines