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CFR review

Free#17 of 24 in Decompiler SoftwareReverse Engineering Tools

A focused, free Java decompiler for class files, JARs, and JVM-language bytecode.

6.9/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

CFR is a standalone Java decompiler that converts Java class files and JAR archives into Java source code. It is aimed at developers, analysts, and technical teams who need a focused way to inspect Java bytecode, including class files produced by other JVM languages. CFR runs from a Java archive and is distributed as open-source software under the MIT License, with a free plan and no paid tier structure described here.

Its strongest case is breadth within Java bytecode decompilation. CFR supports many modern Java language features, processes entire JAR archives, and writes output to a specified directory. The command-line interface accepts configurable options, while options-file customization supports repeatable invocation settings. For automation or integration into another Java workflow, the documented embeddable library API adds a second way to use the decompiler beyond direct command-line execution.

CFR is a good fit when the priority is free, focused Java and JVM-language decompilation rather than a broader reverse-engineering environment. Its stated category specifications include bytecode decompilation and a scripting API, while native code is outside its scope. The official site lists CFR 0.152 as the latest release from December 2021 and notes renewed tinkering in March 2026. Teams looking for debugger workflows, plugin ecosystems, or broader platform and integration coverage should consider a different type of decompiler product.

CFR pros and cons

  • Where it wins
    • Decompiles Java class files and entire JAR archives
    • Supports many modern Java language features and other JVM languages
    • Offers configurable CLI options, output directories, and an embeddable API
  • Where it doesn't
    • Focused on Java bytecode rather than native code
    • Command-line workflow may not suit users seeking visual tooling
    • The latest listed release is CFR 0.152 from December 2021

CFR fact sheet, pricing and score →

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