Inspect Java source from CLASS files using JD-GUI, a standalone graphical decompiler.
Open source
24 alternativesJavaDecompiler
Decompile Java class and JAR files online to inspect their source code with JavaDecompiler.
About JavaDecompiler
JavaDecompiler provides an online interface to extract Java source code from .class and .jar binary files. It presents five decompiler options: CFR, JD, Procyon, Fernflower, and JAD.
Coverage varies by engine. CFR handles Java features through Java 14, Procyon handles up to Java 8, Fernflower supports up to Java 6, and JD supports Java 5. JAD is listed for historical reasons and does not correctly decompile Java 5 and later.
Key features
- Online extraction of source from .class files
- Online extraction of source from .jar files
- CFR engine for Java 7 to Java 14 features
- Procyon engine for Java 5 to Java 8 features
- Fernflower engine for Java up to version 6
- JD engine for Java 5 code
Best for: People who need to inspect source code inside .class or .jar files.
Good for
- Offers five decompiler options in one interface
- CFR option covers Java features through Java 14
- Provides online interface for .class and .jar files
Watch out for
- JAD does not correctly decompile Java 5 and later
- JD supports Java 5 and was updated in 2015
- Fernflower supports up to Java 6 and was updated in 2015
JavaDecompiler at a glance
- Website
- javadecompilers.com
- Category
- Development › Programming Languages
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Android, Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
JavaDecompiler alternatives
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Decompile Java bytecode to Java source with Fernflower, used in IntelliJ IDEA.
Open source
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JavaDecompiler FAQ
What files can I decompile?
.class and .jar binary files.
Which decompilers are presented on the site?
CFR, JD, Procyon, Fernflower, and JAD.
Can JAD decompile recent Java versions?
No. It is included for historical reasons and does not correctly decompile Java 5 and later.
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