The complete Java runtime for modern browsers
CheerpJ is a JVM and a distribution of OpenJDK for the browser in WebAssembly and JavaScript. Now supporting Java 8, Java 11 and Java 17 (preview), with Java 21+ coming in 2026.
Why CheerpJ?
Java Compatibility
Full support for Java 8, Java 11, and Java 17 (preview). Seamlessly migrate your Java applications to the browser.
WebAssembly Performance
High-performance execution via WebAssembly. Experience near-native speeds for Java in the browser.
Legacy Application Support
Modernize legacy Java applications and applets for today’s browsers—no code rewrites needed.
JavaScript Integration
Seamless interoperability between Java and JavaScript. Integrate with modern web frameworks and APIs.
Ratings and adoption
Teams choose CheerpJ to run Java securely and efficiently in the browser.
4.5/5 average rating
Based on user feedback and production deployments
Roadmap
What's Next for CheerpJ
Client Reviews
What People Think About Us
Cheerp blog
