Download Luyten – Free Java Decompiler GUI for Class and JAR Files

Luyten is a free, open-source Java decompiler GUI built on top of the Procyon compiler framework. It allows developers to open compiled Java .class files and JAR archives and view the decompiled Java source code in a clean, readable interface — making it an invaluable tool for reverse engineering, code auditing, and understanding third-party libraries.

Unlike command-line decompilers, Luyten provides a full graphical user interface with syntax-highlighted source code, a tree-based file browser for navigating JAR contents, and the ability to save decompiled source files for further analysis. It handles modern Java features well, including generics, lambdas, and try-with-resources.

Luyten is widely used by Java developers for debugging obfuscated code, auditing dependencies for security issues, and recovering lost source code from compiled artifacts. It is lightweight, starts quickly, and requires only Java to run.

Key Features

• Decompiles Java .class files and JAR archives to readable Java source code
• Syntax-highlighted source code display for easy reading and navigation
• Tree-based JAR file browser to explore package and class structures
• Supports modern Java features including generics, annotations, and lambda expressions
• Export decompiled source to files for offline review or editing
• Powered by the Procyon decompilation engine for high-quality output
• Cross-platform — runs on any system with Java installed (Windows, Linux, macOS)

How to Install

1. Click the download button below to get the Luyten JAR file.
2. Ensure Java Runtime Environment (JRE) 8 or higher is installed on your system.
3. Double-click the luyten.jar file to launch the application, or run: java -jar luyten.jar
4. Use File > Open to load a .class file or JAR archive.
5. Browse the class tree and click any class to view the decompiled source code instantly.