Java CFR Online Decompiler

A web-based Java decompiler running entirely in your browser.

LiveDemo

Features

• Client-side only - No server required, privacy-focused
• High-quality output - CFR engine produces readable Java code
• Syntax highlighting - Clean code display with line numbers
• Completely free - No limits or registration required

Quick Start

1. Visit the website
2. Click "Choose File" to upload .jar
3. View decompiled source code instantly

How It Works

The tool runs entirely in your browser:

1. Reads uploaded file via FileReader API
2. Uses JSZip to extract JAR files
3. Decompiles bytecode using CFR engine
4. Displays syntax-highlighted Java code

Usage Examples

• Analyze third-party libraries
• Learn Java bytecode structure
• Educational purposes

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Note: Use responsibly and respect software licenses.