Recaf – Java bytecode editor

Recaf is an easy to use modern Java bytecode editor that abstracts away the complexities of Java programs.

This is free and open source software.

Key Features

• Edit Java bytecode with ease from a high or low level (minus the annoying parts).
  • Editor features within Recaf abstract away complex details of compiled Java applications like:
    • The constant pool.
    • Stack frame calculation.
    • Using wide instructions when needed.
• Easy to use navigable interface with context-sensitive actions.
• Support for standard Java and Android applications.
• Multiple decompilers to switch between, with all of their parameters made fully configurable.
• Built in compiler to allow recompiling decompiled classes, even if some referenced classes are missing (When supported, support may vary depending on code complexity and obfuscation).
• A bytecode assembler with a simple syntax, and supporting tooling.
  • See the state of local variables and stack values at any point in methods.
  • Access variables by names instead of indices for clearer disassembled code.
  • Convert snippets of Java source code to bytecode sequences automatically.
• Searching for a variety of different content: Strings/numeric constants, classes and member references, instruction patterns.
• Tools for deobfuscating obfuscated code.
  • Specially crafted class files with the intent of crashing reverse engineering tools are automatically patched when opened in Recaf.
  • Specially crafted jar/zip files are read as the JVM does, bypassing sneaky tricks that can trick reverse engineering tools into showing the wrong data.
  • Support for automatically renaming obfuscated classes and their members.
  • Support for manually renaming classes and their members (And exporting these mappings to a variety of mapping formats for use in other tools).
  • Bytecode transformers for simplifying common obfuscation strategies.
• Attach to running Java process with instrumentation capabilities.

Website: github.com/Col-E/Recaf
Support:
Developer: Matthew Coley
License: MIT License

Recaf is written in Java. Learn Java with our recommended free books and free tutorials.

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