Cross-platform Java executable wrapper for creating lightweight Windows native EXEs. Provides advanced JRE search, application startup configuration and better user experience.


  • Launch4j wraps jars in Windows native executables and allows to run them like a regular Windows program.
  • It's possible to wrap applications on Windows, Linux and Mac OS X.
  • Also creates launchers for jars and class files without wrapping
  • Supports executable jars and dynamic classpath resolution using environment variables and wildcards.
  • Doesn't extract the jar from the executable.
  • Native pre-JRE splash screen in BMP format shown until the Java application starts.
  • Initial priority and single application instance features.
  • Works with a bundled JRE or searches for newest Sun or IBM JRE / JDK in given version range and type (64-bit or 32-bit).
  • Supports GUI and console apps.
  • Supports Windows application manifests.
  • Allows to set the initial/max heap size also dynamically in percent of free memory.
  • JVM options: set system properties, tweak the garbage collection...
  • Runtime JVM options from an .l4j.ini file.
  • Runtime command line switches to change the compiled options.
  • Access to environment variables, the registry and executable file path through system properties.
  • Set environment variables.
  • Ability to restart the application based on exit code.
  • Custom version information shown by Windows Explorer.
  • Digital signing of the executable with sign4j.
  • Supports Windows Security Features of the Windows 8 certification kit.
  • GUI and command line interface.
  • Build integration through an Ant task and a Maven Plugin.
  • Lightweight: 35 KB!
  • The wrapped program works on Windows only, but Launch4j works on Windows, Linux and Mac OS X.

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Additional Project Details



Intended Audience

Developers, End Users/Desktop

User Interface

Java Swing, Command-line

Programming Language

C, Java