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java code obfuscationProGuard: Java and Android App Optimizer

The open source optimizer for Java bytecode

ProGuard is the most popular optimizer for Java bytecode. It makes your Java and Android applications up to 90% smaller and up to 20% faster. ProGuard also provides minimal protection against reverse engineering by obfuscating the names of classes, fields and methods.

ProGuard can be used free of charge to process your applications, commercial or not. The ProGuard code itself is copyrighted and is distributed under the terms of the GNU General Public License (GPL), version 2.


Desktop applications

ProGuard obfuscates Java applications and pre-verifies the processed code for Java Micro Edition and for Java 6 and higher.  

Embedded apps

Embedded applications

ProGuard optimizes and obfuscates Java applications for cell phones, Blu-ray players, set-top boxes and other constrained devices.  

Mobile apps

Mobile applications

ProGuard reduces the download and startup time of Android applications and improves their performance on mobile devices.  


  • ProGuard is a command-line tool with an optional graphical user interface.
  • ProGuard is easy to configure. A few intuitive command line options or a simple configuration file is all it takes. All available options are detailed in the user manual.
  • ProGuard is fast. It processes small Android applications and entire runtime libraries in seconds.
  • ProGuard is the default tool in development environments like Oracle’s Wireless Toolkit, NetBeans, EclipseME, Intel’s TXE SDK and Google’s Android SDK.


"ProGuard is the ultimate Java obfuscator!"


"ProGuard is pure quality - powerful and trouble-free."

M.B., Statestep

"ProGuard rules. Much easier to use than the commercial alternatives."

B.G., Quiotix Corp

"ProGuard is a seriously sweet tool."

D.E., Google

"It is the simplest and most robust obfuscator we have ever used."

I.I., Hewlett-Packard

Get started with ProGuard


Download ProGuard

Download and contribute to ProGuard. You can submit bug reports, add feature requests and join the open discussions forum on our SourceForge page.

Download on SourceForge

ProGuard manual

ProGuard manual

All the information you need to set up ProGuard is detailed in the ProGuard manual. The manual is included in the ProGuard download and can also be consulted online.

ProGuard manual