Mobile app protection
Threat Protection
Prevent mobile app exploitation
Code Hardening
Protect APK and SDK code
Runtime Application Self-Protection (RASP)
Defend apps at runtime
Quicklinks
Security for Mobile Financial Apps
Unity Support Product Page
Products
DexGuard
Protect & optimize Android apps and SDKs
iXGuard
Protect iOS apps and SDKs
ProGuard
Optimize Java and Android apps
ThreatCast
Monitor threats to Android and iOS apps
Quicklinks
Download DexGuard fact sheet
Download iXGuard fact sheet
Download ThreatCast fact sheet
ProGuard Manual
Resources
Guardsquare Blog
Learn about mobile application security best practices, industry news, and much more.
Engineering Blog
Learn about technical topics related to mobile app security, straight from our engineers
Resource Center
Find in-depth information on topics related to mobile app security, Android, iOS, and beyond
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About us
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ProGuard

ProGuard: Open Source Optimizer for Java and Kotlin

Open Source Optimizer for Java and Kotlin

ProGuard is the most popular optimizer for Java bytecode. Use ProGuard to make your Java and Kotlin applications up to:

90% smaller
20% faster

ProGuard also provides minimal protection against reverse engineering by obfuscating the names of classes, fields and methods.

ProGuard manual >

Download ProGuard

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

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

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

Highlights

ProGuard fully supports Java and Kotlin applications, enabling developers to take full advantage of these languages’ features without sacrificing performance or security.
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.

Testimonials

"ProGuard is the ultimate Java obfuscator!"

P.S., IBM

"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

Spotlight on ProGuardCORE

ProGuardCORE allows developers to integrate ProGuard’s powerful code parsing capabilities into their own Java bytecode projects. It provides the functionality needed to read, write, modify and analyze Java class files.

Get started with ProGuardCORE