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JAR CLASS
File conversion

Convert JAR to CLASS

Verified by Adam B.· reviewed by FE Editorial ·updated Jun 19, 2026
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Is it possible to convert JAR to CLASS?
Yes - JAR converts to CLASS.

Unpack the .jar with 7-Zip or any ZIP tool and the .class files are immediately accessible, organized by Java package name. The files contain compiled Java bytecode, not readable source code; to inspect the logic you need a decompiler such as JD-GUI or CFR.

Also to CLASS: JAVA

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert JAR to CLASS?

A JAR (Java Archive) is a ZIP container holding compiled .class files organized by Java package name. Developers extract individual classes to inspect bytecode, patch a single file without repackaging the whole archive, manually add them to a classpath, or feed them into a decompiler to check what version of a library they actually have.

How to convert JAR to CLASS

7-Zip FREE

Right-click the .jar and choose 7-Zip > Open archive, then extract the .class files you need from their package subdirectories.

jar (JDK) FREE

Run jar xf app.jar in a terminal to extract all contents; .class files appear in their Java package subdirectories.

About these formats

.JAR Java Archive

A JAR file is a Java Archive - a ZIP bundle of compiled Java bytecode (.class files), resources, and a manifest. To run an executable JAR you need Java installed (OpenJDK/Temurin is free),…

Open .JAR details →
.CLASS Java Bytecode Class File

A CLASS file is compiled Java bytecode - the output javac produces from a .java source file. To run it you need Java (a JDK) installed, then use the command "java MyClass". To read what the…

Open .CLASS details →

Quality & what to watch

  • A .jar is a standard ZIP archive - the extension is the only difference; renaming it to .zip lets any archive tool open it without extra software.
  • .class files contain compiled Java bytecode, not human-readable source; to read the logic, pass the files through a decompiler such as JD-GUI or CFR - decompiled output is an approximation.
  • The internal folder structure mirrors Java package names (e.g., com/example/App.class); extracted files land in their package subdirectories.

Frequently asked questions

Do I need to install anything to extract .class files from a JAR?
No - rename the .jar to .zip and open it in Windows Explorer or macOS Finder; the .class files are inside and can be copied out directly.
Can I read the logic inside a .class file?
Not directly - .class files are compiled bytecode; run them through JD-GUI or CFR to get approximate Java source code.
Is extracting .class files the same as decompiling?
No - extraction gives you the raw .class bytecode files; decompiling is a further step that attempts to reconstruct readable Java source from those files.