Java Decompiler Online
Upload .class or .jar files to view class structure, fields, and method signatures. For full Java source (same as original code), use CFR, Fernflower, or other full decompilers.
Java Decompiler
Structure and signatures only. Method bodies are not converted to Java — for that you need a full decompiler (CFR, Fernflower, Procyon).
Drop .class or .jar file here, or browse
Supports single .class files and .jar archives (multiple classes). Use a compiled .class or .jar — not .java source.
What does the Java decompiler show?
It extracts class name, fields, and method signatures from .class or .jar files. It does not produce full Java source for method bodies. For output that looks like original Java code, use a full decompiler such as CFR, Fernflower, or Procyon.
Is it safe?
Yes. Files are processed in your browser only. Nothing is sent to any server.