leibnitz27/cfr

Health v2 · maintenance only

Adoption not part of the score

2675 stars · 329 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

CFR (Class File Reader) is a Java decompiler written entirely in Java 6 that can decompile modern Java bytecode, including features from Java 9 through 14+, and even class files from other JVM languages. It can be used as a command-line tool on individual classes or entire jars, and also exposes an API since version 0.135.

Use cases

• decompile a java class file back to source
• decompile an entire jar to java source code
• recover source code from compiled java bytecode
• decompile modern java features like switch expressions and pattern matching
• decompile kotlin or scala class files to java
• analyze obfuscated or third-party java bytecode
• use a java decompiler as a library via API

When to choose

• you need to decompile bytecode from recent Java versions (9-14+) while running on an old JVM
• you want a dependency-free, standalone jar decompiler
• you need to decompile whole jars with output to a directory
• you want a decompiler usable both as CLI and as an embedded API

When to avoid

• you need to decompile non-JVM languages like C or .NET assemblies
• you need a GUI-based decompiler experience
• you require line-number-perfect output for debugger use without caveats

Facets

cli-tool · maturity maintenance

parser reverse-engineering developer-tools developer-tools reverse-engineering jvm cli cross-platform java-decompiler class-file-reader bytecode-analysis jar-decompilation jvm

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