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Shrink your Java and Android code

Use ProGuard®, Guardsquare’s open-source shrinker for Java bytecode, to enhance and optimize your code.

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ProGuard®

The original Java optimizer for Android apps.

shrink

Shrink

Use ProGuard to shrink any Java or Kotlin app, whether on mobile, embedded or on desktop.

2-optimize2

Optimize

ProGuard optimizes apps by reducing their size and improving performance, ensuring a more efficient and seamless user experience.

Supported Technologies

proguard-java-kotlin-shrinker

Your free, open source shrinker for Java/Kotlin apps

ProGuard is a command-line tool that reduces app size by shrinking bytecode; it obfuscates the names of classes, fields and methods. It’s an ideal fit for developers working with Java or Kotlin who are primarily interested in an Android optimizer.

ProGuard Environments

ProGuardCORE
ProGuard Playground
proguardCORE

Read, write, analyze, and process Java bytecode

ProGuardCORE is a free and open-source library that serves as the core of ProGuard. What’s more, it was used as the basis for the ProGuard Assembler/Disassembler and the Kotlin Metadata Printer. Developers can use ProGuardCORE to integrate ProGuard’s code parsing capabilities into their own Java bytecode projects.

  • Read and write class files, including any Kotlin metadata

  • Search for instruction patterns

  • Create byte code instrumentation tools

  • Analyze code with abstract evaluation

  • Build static code analysis tools

  • Optimize and obfuscate, just like ProGuard itself

  • And more

 

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proguard playguard

Visual configuration assistant

Using ProGuard Playground, you can experiment with and share your keep rules — that is, the rules that preserve your app’s libraries, resources, resource files and assets after ProGuard shrinks your mobile app — without needing to rebuild your app.

 

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2021_08_video_ProGuard_vs_DexGuard

ProGuard vs. DexGuard

Although ProGuard is a great start to mobile app optimization, its primary purpose is to shrink Java/Kotlin apps. DexGuard, our comprehensive Android mobile application security product provides protection from static and dynamic analysis through layered obfuscation and encryption techniques complemented by automated RASP checks and built-in malware defenses. DexGuard, integrates seamlessly with your existing ProGuard (or R8) configuration.

 
Learn more about DexGuard

Discover how ProGuard optimizes and shrinks Android and Java/Kotlin apps.

View the Manual