What is a CLASS file?
When Java source code is compiled, it becomes bytecode stored in .class files. JAR archives often contain many CLASS files inside package folders.
Can the website decompile CLASS files?
The first web version supports CLASS detection, download, and Hex view. Full online decompilation is not included because browser-based decompilers can be heavy and inconsistent.
Use the Android app for decompilation
Jar File Opener for Android can inspect CLASS files and decompile supported CLASS files to Java. This is better for mobile users who want an offline app experience.
Important legal note
Only decompile files you own or have permission to inspect. Decompiled output may not match the original source code and may be incomplete.
Use the homepage tool to inspect a JAR file locally in your browser, or download the Android app for offline file inspection on your phone.
Open Online Tool Download Android App