Konloch/bytecode-viewer

Health v2 · maintenance only

Adoption not part of the score

15614 stars · 1274 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Bytecode Viewer is a free, open-source Java and Android APK reverse engineering suite that bundles six Java decompilers, bytecode disassemblers/assemblers, a Java compiler, and search functionality in one GUI tool. It supports loading Class, Jar, APK, DEX, XAPK, WAR, and JSP files and includes a plugin system with a malicious code scanner.

Use cases

• decompile a Java jar back to source code
• reverse engineer an Android APK
• view and edit smali code from a DEX file
• scan jars for malicious code
• compare output of multiple Java decompilers
• decompile class files from the command line
• recompile edited Java or bytecode into a runnable jar

When to choose

• you need multiple decompilers (CFR, Procyon, FernFlower, JADX, etc.) in one tool
• you want a drag-and-drop GUI for analyzing jars and APKs
• you need to edit and recompile smali or Java bytecode
• you want a free GPL-licensed alternative to commercial decompilers

When to avoid

• you only need a headless decompiler library to embed in your own build pipeline
• you need to decompile non-JVM languages like native C/C++ binaries
• you require a lightweight IDE-integrated plugin rather than a standalone app

Facets

application · maturity active

reverse-engineering gui cli linter security reverse-engineering security developer-tools android-tools cross-platform cross-platform cli jvm decompiler bytecode apk smali dex2jar java-reverse-engineering malware-analysis desktop

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