Java Decompilers
javadecompilers.com
Java decompiler online
Java decompilers online: *JAD, *JDCore, *Procyon, *Fernflower, *CFR. ✓ A user interface to extract source code from .class and .jar ‘binary’ files.
Decompiler.com
decompiler.com
Java decompiler online / APK decompiler - Decompiler.com
Online decompiler for Java, Android, Python and C#.
What is the difference between the decompiler engines?
Each engine has different strengths. CFR is reliable for most Java versions. JADX excels at Android APKs. Vineflower (Quiltflower fork) handles modern Java well. Procyon is solid for older bytecode. JD-Core is fast for quick inspections.
endless-forge.com
endless-forge.com › en › tools › java › decompiler
Java Decompiler Online: Decompile .class & .jar Files | Endless Forge
How do I decompile a JAR file online?
Upload your .jar file, wait for decompilation to complete, then download the generated source ZIP.
jar.tools
jar.tools › jar-decompiler
Java Decompiler Online | Decompile JAR to Java Source
Can I decompile obfuscated code?
Yes, but obfuscated code will produce decompiled output with meaningless variable and class names. The logic is recovered but human readability depends on how aggressively the code was obfuscated.
endless-forge.com
endless-forge.com › en › tools › java › decompiler
Java Decompiler Online: Decompile .class & .jar Files | Endless Forge
Videos
Jdec
jdec.app
JDec - Java Decompiler Online
JDec is a online Java decompiler that provides a fast way to decompile JAR files. Instant access to the files, no need to wait. Also supports downloading decompiled java code.
Javainuse
javainuse.com › decomp
Java Decompiler Online
A Java decompiler is a specialized tool that reconstructs Java source code from compiled bytecode (.class files). This online decompiler uses CFR (Class File Reader), one of the most advanced Java decompilers, to reverse-engineer bytecode into human-readable Java source code.
Java Decompiler
java-decompiler.github.io
Java Decompiler
The “Java Decompiler project” aims to develop tools in order to decompile and analyze Java 5 “byte code” and the later versions.
Jar
jar.tools
JAR Tools — Online Java Decompiler, JAR Editor & Viewer
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JAR Tools
jar.tools › jar-decompiler
Java Decompiler Online | Decompile JAR to Java Source
Decompile Java JAR files online and download readable .java source as a ZIP. Batch decompile .class files with no installation.
Medium
medium.com › @aashupel2023 › the-best-java-decompilers-online-in-2023-517bf6f4971f
The Best Java Decompilers Online in 2023 | by Perfect eLearning | Medium
September 8, 2023 - Learn about the best Java decompilers online in 2023. These tools can help you decompile Java code without installing any software. Find…
Java Code Geeks
javacodegeeks.com › home › core java
13 Best Java Decompilers for Download and Online Use for Java Developers - Java Code Geeks
November 17, 2021 - This is kind of all in one decompiler but it is online. You can decompiler java classes, F#, C#, android, python and lua code as well.
Endless Forge
endless-forge.com › en › tools › java › decompiler
Java Decompiler Online: Decompile .class & .jar Files | Endless Forge
Decompile Java .class and .jar files directly in your browser. Choose from 5 decompiler engines: CFR, JADX, Vineflower, Procyon, and JD-Core. No install required.
Devhunt
devhunt.org › tool › java-decompiler-online
Java Decompiler Online - Decompile, analyze, and optimize Java code online for better performance.
Decompile, analyze, and optimize Java code online for better performance.
CybersecTools
cybersectools.com › home › security operations › offensive security › java decompiler online
Java Decompiler Online
May 27, 2026 - Java Decompiler Online is Online Java decompiler tool with support for modern Java features.
Appscms
appscms.com › jar-decompiler
Safe Online JAR Decompiler
Java program developers can easily decompile JAR files with our online JAR Decompiler tool to extract source codes and other contents with ease.
Edopedia
edopedia.com › blog › best-java-decompilers
23 Best Java Decompilers [cy] (Ranked and Reviewed)
September 16, 2025 - In our case, we will only upload the .jar or .class file. After that, the tool will automatically select the Java decompiler for processing the files. View the decompiled source code online without installing anything.
Product Hunt
producthunt.com › home › java decompiler online
Java Decompiler Online: a tool for converting class files to java source files | Product Hunt
January 20, 2026 - Java Decompiler Online is an online tool for converting class files to java source files. It supports different file formats, includingclass,jar,zip and others. It is an efficient and smart way to decompile the java code.
Java Decompilers
javadecompilers.com › apk
APK decompiler - decompile Android .apk ✓ ONLINE ✓
Decompile Android Apk applications and extract Java source code and resources ✓ ONLINE ✓
MCP Market
mcpmarket.com › home › mcp servers › java decompiler
Java Decompiler: Decompile Java Class Files Online
This tool provides an MCP-compatible server for decompiling Java bytecode into readable source code. It leverages a JavaScript port of the CFR decompiler to decompile Java .class files from various sources, including file paths, package names, and JAR files.
Codeusingjava
codeusingjava.com › tools › javadecompiler
Free Java Decompiler Online Tool
Online Jasypt Encryption and Decryption Tool · Free Java Decompiler Online Tool · ✖This site uses cookies to deliver our services and to show you relevant ads. By continuing to visit this site you agree to our use of cookies.
Reddit
reddit.com › r/java › looking for a java decompiler
r/java on Reddit: Looking for a Java decompiler
June 13, 2017 -
I have a couple of .jar games on my disk. I want to decompile the bytecode back to the readable .java format.
What are my options? Google wasn't very helpful, throwing old sites at me with broken download links.
I just want to learn - I played the game lots of times so I know what it does, now I want to know how it does it.
EDIT: Thanks to everyone who replied, the post stays so that others can use. I decided to use jd-gui, but it's good to know many Java IDEs have plugins to do this too (I use Netbeans and I couldn't find a decompiler plugin for it)
Top answer 1 of 5
20
I've had a good experience with this one: http://jd.benow.ca/ EDIT: You decompile the .class file, which is a compiled .java file. A .jar file may contain .java files as well.
2 of 5
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i would try fernflower from intellij ( https://github.com/JetBrains/intellij-community/tree/master/plugins/java-decompiler/engine ) for this.