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Bytecode Viewer
Bytecode Viewer - a lightweight user-friendly Java/Android Bytecode Viewer, Decompiler & More.
New Features
- Dark mode with multiple themes
- Translated into over 30 languages including: Arabic, German, Japanese, Mandarin, Russian, Spanish
- Plugin Writer - create and edit external plugins from within BCV
- Fixed Java & Bytecode editing/compiling
- Tabbed plugin console
- Javap support
- XAPK support
- Updated nearly all dependencies (incl. decompilers like CFR, JD-GUI etc.)
- Updated ASM library to version 9.1
- Added support to Java files compiled using JDK > 13
- Migrated to Maven
v2.10.x Notes
- The rewrite/refactoring process is currently ongoing so please report any bugs you find
- If you're encountering any issues try using v2.9.22
Links
- BCV Discord
- Website
- Source Code
- Bin/Archive
- Java Docs
- License (Copyleft)
- Credits
- Contributing
- Report Bugs
- Discussion Forum
Key Features
- Simply drag and drop to decompile and search Java Jars & Android APKs
- File format support for: Class, Jar, XAPK, APK, DEX, WAR, JSP, Image Resources, Text Resources & More
- 6 Built-in Java decompilers: Krakatau, CFR, Procyon, FernFlower, JADX, JD-GUI
- 3 Built-in Bytecode disassemblers, including 2 assemblers: Krakatau and Smali/BakSmali
- APK/DEX Support from Dex2Jar and Enjarify
- Built-in Java Compiler
- Advanced static-search functionality
- Customizable UI
- Plugins + Script Engine Design
- Malicious code scanning API
- Translated Into over 30 Languages Including: Arabic, German, Japanese, Mandarin, Russian, Spanish)
- Export functionality as Runnable Jar, Zip, APK, Decompile All As Zip, Etc.
- And more! Give it a try for yourself!
Command Line Input
-help Displays the help menu
-clean Deletes the BCV directory
-english Forces English language translations
-list Displays the available decompilers
-decompiler <decompiler> Selects the decompiler, procyon by default
-i <input file> Selects the input file (Jar, Class, APK, ZIP, DEX all work automatically)
-o <output file> Selects the output file (Java or Java-Bytecode)
-t <target classname> Must either be the fully qualified classname or "all" to decompile all as zip
-nowait Doesn't wait for the user to read the CLI messages
What is Bytecode Viewer?
Bytecode Viewer (BCV) is an Advanced Lightweight Java/Android Reverse Engineering Suite. Powered by several open source tools BCV is designed to aid in the reversing process.
BCV comes with 6 decompilers, 3 disassemblers, 2 assemblers, 2 APK converters, advanced searching, debugging & more.
It's written completely in Java, and it's open sourced. It's currently being maintained and developed by Konloch.
Is there a demo?
Please note this demo is from a very old version
How do I install BCV?
Download the latest version from https://github.com/konloch/bytecode-viewer/releases and run the Bytecode-Viewer-2.10.x.jar.
You may need to execute it via command line java -jar Bytecode-Viewer-2.10.x.jar
(replace the X with the current minor version)
How can I use BCV?
- Starting with a Jar, Zip, ClassFile or Android file (APK, DEX, XAPK, etc) drag it into BCV. It will start the decoding process automatically.
- From here you can select the decompilers you would like to use by selecting the View Pane>View 1, View 2, View 3, etc.
- The view panes are-used to display up to 3 decompilers side by side, you can also toggle edibility here.
- Select the resource you would like to open by navigating using the resource list, BCV will do its best to display it (Decompiling, Disassembling, etc).
- You can use plugins to help you search along with using the search pane in the left-hand bottom corner.
How do the plugins work?
There is also a plugin system that will allow you to interact with the loaded classfiles. You could for example write a String deobfuscator, a malicious code searcher, or anything else you can think of.
You can either use one of the pre-written plugins, or write your own. The plugin system supports java and javascript scripting.
Once a plugin is activated, it will execute the plugin with a ClassNode ArrayList of every single class loaded in BCV, this allows the user to handle it completely using ASM.
Instructions to compile
Just clone this repo and run mvn package
. It's that simple!
Working on the source
Open the Maven project (e.g. in IntelliJ, open the pom.xml
as a project file).
Java Heap Space Issues
Start BCV with more RAM, e.g. java -Xmx3G -jar BCV.jar
Are you a Java Reverse Engineer? Do you want to learn?
Join The Bytecode Club Today! - https://the.bytecode.club