What is the best Java decompiler for Windows?

With no install: JAR Tools in your browser. From the command line: CFR. Inside an IDE: IntelliJ IDEA.

Is there a JD-GUI download for Windows?

Yes, the Windows release is a ZIP with jd-gui.exe. It still needs Java installed, and it struggles with modern bytecode. See JD-GUI Alternative.

Can I decompile a JAR on Windows without installing Java?

Yes. JAR Tools decompiles in the browser, so nothing runs on your PC.

Why does double-clicking a decompiler .jar open 7-Zip?

Your archive tool owns the .jar association. Run the tool with java -jar tool.jar from PowerShell, or see JAR File Won't Open? to fix the association. ---

Best Java Decompiler for Windows (10 & 11)

Decompile JAR and .class files on Windows 10 or 11: a browser option with no install, CFR from PowerShell, IntelliJ IDEA, and what to expect from JD-GUI's .exe.

Best Java Decompiler for Windows (10 & 11)

The Windows Pain Points

Option 1: Decompile in the Browser (No Install)

Option 2: CFR from PowerShell or Command Prompt

Option 3: IntelliJ IDEA

JD-GUI on Windows — What to Expect

Comparison: Java Decompilers on Windows

FAQ

Summary