CheerpJ is a WebAssembly-based Java Virtual Machine for the browser. This means Java applications and libraries can be executed from the browser with no Java installations.
It has extensive compatibility with Java 8*, including file access, networking, clipboard, and many other system features. It is compatible with Java Swing, Oracle Forms, Oracle EBS, and any other framework or library. Other Java versions can be supported according to your needs.
*Tested on Oracle Forms, EBS, Swing, AWT and numerous frameworks and libraries.
With CheerpJ Organisations with products based on Java can migrate applications to HTML5 or the cloud with minimal or no effort, making them accessible from modern browsers, without a local Java installation.
CheerpJ allows a fully automated, full or partial migration of an existing Java client to a browser-based web application.
A full runtime environment for running Java applications, Applets, and Libraries in the browser.
Run Java Web Start (JWS) applications on Chrome and Edge, without a local Java Desktop installation.
Allows on-the-fly execution of Applet(s) exclusively on Chrome or Edge browsers.
Not sure where to start? Find out which of our tools is best for you.
A superb extension with great customer support! We have an large, extensive applet that displays automated weather reports from commercial aircraft that is used by weather services world-wide. Thanks to CheerpJ we can now run it again in a browser (chrome). The CheerpJ version is FAST, able to display 800,000+ wind barbs in just a couple of seconds. We’re very happy indeed.
Fantastic job. My large JAVA applet for a visual interactive discovery of derivatives and integrals of vector fields had been used all around the world for almost 20 years — then the browsers effectively killed it by withdrawing support for JAVA. I had not been able to rewrite it as a freestanding JAVA main program. So happy when I discovered CheerpJ in the spring. So many happy students, instructors, and folks from everywhere who just to play and discover!
Matthias Kawski
This is great! I had a set of online “animated diagrams” as Java applets since about 1999. Over the years, support for Java in browsers has disappeared due to security concerns. Now I can see my old applets again.
Craig Reynolds
Simply amazing simplicity and effectiveness. Very useful with old switches that only have a Java Applet interface and other similar appliances. Great job!
Gianluca Bonetti
The Java Applet I am using looks and behaves very similarly under CheerpJ on a modern computer, vs an ancient computer with an old browser that actually runs Java applets. Performance is good, too. Five stars!
Leaning Technologies coupled their clear ability to extend their toolset to support the ultimate software challenge with an unwavering determination to achieve the level of perfection required. After an intense but relatively short period, Blackbird was able to ship our [HTML] product to clients globally.
Stephen Streater
R&D Director, Blackbird PLC
Discover how to modernize and improve access to your legacy Java applications with CheerpJ.
Schedule a free demo with our team to learn how CheerpJ can help address your Java requirements.
Fill in the form or book a demo directly here
English (UK) 
日本語