The industry-leading Java optimizer for Android apps. Use ProGuard to shrink any Java or Kotlin app, whether on mobile, embedded, or on desktop. ProGuard makes apps up to 90 percent smaller and 20 percent faster, all while providing basic defense against static reverse engineering with code obfuscation. Proguard open source community consists of engaged developers across the globe and the Guardsquare team, dedicated to keeping the community active and thriving.