Bytecode Viewer (BCV) is an advanced, lightweight, and open-source Java and Android Reverse Engineering Suite. Originally created and maintained by developer Konloch, it serves as an all-in-one graphical tool that combines multiple industry-standard decompilers and disassemblers into a single interface. It is highly regarded by security researchers, malware analysts, and developers because it eliminates the need to jump between separate tools when trying to reverse-engineer compiled Java binaries.
The tool is written completely in Java and is available directly on the Konloch/Bytecode-Viewer GitHub Repository. Key Capabilities and Engine Integrations
Bytecode Viewer functions as a wrapper and orchestration platform for several powerful lower-level tools. Instead of relying on just one engine, it provides a comprehensive toolkit under one hood:
6 Built-in Decompilers: It integrates CFR, Procyon, FernFlower, Krakatau, JADX, and JD-GUI. This allows users to display up to three different decompilation results side-by-side to see which engine handles heavily obfuscated code best.
3 Disassemblers & 2 Assemblers: For low-level analysis of JVM stack instructions, it includes tools like Krakatau and Smali/BakSmali (essential for Android DEX manipulation).
Broad File Format Support: Users can seamlessly drag and drop .class, .jar, .zip, .apk, .dex, .war, and .jsp files.
Extensible Architecture: It features a built-in compiler (javac), a Python-based plugin/scripting engine, and a specialized malicious code scanning API to help look for common payloads or backdoors automatically. Core Workflows in Reverse Engineering 1. Static Analysis & Comparing Decompilers
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