Best Java Decompiler Online Alternatives & Competitors in 2026

ReversingLabs Spectra Analyze

Malware analysis platform for SOC teams with binary analysis and threat detection

Nightwing DejaVM

Whole-system emulation environment for software dev, debugging, testing & security

Joe Sandbox DEC

Plugin that decompiles malware PE files into readable C code using hybrid analysis.

Joe Security Joe Reverser

Agentic AI tool for automated malware reverse engineering & phishing analysis.

Zenyard RE Agent

AI agent for in-depth binary analysis and reverse engineering assistance.

RevEng.AI

AI-powered binary analysis platform for reverse engineering & malware analysis.

CodeHunter Labs

Research division powering CodeHunter's pre-execution malware detection engine.

de4dot

An open source .NET deobfuscator and unpacker that restores packed and obfuscated assemblies by reversing various obfuscation techniques.

x64dbg

An open-source binary debugger for Windows with a comprehensive plugin system for malware analysis and reverse engineering.

Radare2

A powerful reverse engineering framework

Boomerang Decompiler

An open source machine code decompiler that converts binary executables into readable C source code across multiple architectures and file formats.

GrammaTech DDisasm

Fast disassembler producing reassemblable assembly code using Datalog

Shellcode2PE

A Python script that converts shellcode into a PE32 or PE32+ file.

Mastiff

A static analysis framework for extracting key characteristics from various file formats

CAPA

CAPA is a static analysis tool that detects and reports capabilities in executable files across multiple formats, mapping findings to MITRE ATT&CK tactics and techniques.

Viper

A binary analysis and management framework for organizing and analyzing malware and exploit samples, and creating plugins.

floss

A tool that extracts and deobfuscates strings from malware binaries using advanced static analysis techniques.

manalyze

A static analysis tool for PE files that identifies potential malicious indicators through compiler detection, packing analysis, signature matching, and suspicious string identification.

strings

A command-line utility for extracting human-readable text from binary files.

edb

edb is a powerful debugger for Linux binaries, enhancing reverse engineering efforts with a user-friendly interface and extensible plugins.

ThreatCheck

A comprehensive malware-analysis tool that utilizes external AV scanners to identify malicious elements in binary files.

dnSpy

A .NET assembly debugger and editor that enables reverse engineering and dynamic analysis of compiled .NET applications without source code access.

Polichombr

A collaborative malware analysis framework with various features for automated analysis tasks.

PinCTF

PinCTF is a Python wrapper tool that uses Intel's Pin framework to instrument binaries and count instructions for reverse engineering analysis.

RABCDAsm

RABCDAsm is a collection of utilities for ActionScript 3 assembly/disassembly and SWF file manipulation.

TRISIS / TRITON / HatMan Malware Repository

Repository of TRISIS/TRITON/HatMan malware samples and decompiled sources targeting ICS Triconex SIS controllers.

smali/baksmali

Assembler/disassembler for the dex format used by Dalvik, Android's Java VM implementation.

Triton

Dynamic binary analysis library with various analysis and emulation capabilities.

Ghidra Software Reverse Engineering Framework

Ghidra is an NSA-developed software reverse engineering framework that provides disassembly, decompilation, and analysis tools for examining compiled code across multiple platforms and processor architectures.

Krakatau

A Java bytecode assembler and disassembler toolkit that converts classfiles to human-readable format and provides decompilation capabilities for reverse engineering Java applications.

dynStruct

dynStruct is a tool for monitoring memory accesses of an ELF binary and recovering structures of the original code.

angr

angr is a Python-based binary analysis framework that provides disassembly, symbolic execution, and program analysis capabilities for cross-platform binary examination.

Capstone Engine

A disassembly framework with support for multiple hardware architectures and clean API.

RetDec

RetDec is an LLVM-based decompiler that converts machine code from various architectures and file formats back into readable C-like source code for reverse engineering and malware analysis.

Pylibemu

A Python wrapper for the Libemu library that enables shellcode analysis and malicious code examination through programmatic interfaces.

ctf_import

A C library that enables cross-platform execution of functions from stripped binaries using file names, offsets, and function signatures.

BinaryPig

A malware processing and analytics tool that utilizes Pig, Django, and Elasticsearch to analyze and visualize malware data.

Fernflower

Fernflower is an analytical decompiler for Java with command-line options and support for external classes.

StringSifter

StringSifter is a machine learning tool that automatically ranks strings extracted from malware samples based on their relevance for analysis.

Frida

Dynamic instrumentation toolkit for developers, reverse-engineers, and security researchers.

PINT

PINT is a PIN tool that enables Lua scripting for Intel's PIN dynamic instrumentation framework, allowing researchers to inject custom code during binary analysis processes.

SchemDBG

A backend agnostic debugger frontend for debugging binaries without source code access.

ILSpy

ILSpy is the open-source .NET assembly browser and decompiler with various decompiler frontends and features.

JD-GUI

JD-GUI is a graphical Java decompiler that reconstructs and displays source code from compiled ".class" files for reverse engineering and code analysis purposes.

PLASMA

PLASMA is an interactive disassembler that generates readable assembly code with colored syntax for reverse engineering binary files across multiple architectures and formats.

Dorothy2

A malware/botnet analysis framework with a focus on network analysis and process comparison.

FLARE Obfuscated String Solver (FLOSS)

FLOSS is a static analysis tool that automatically extracts and deobfuscates hidden strings from malware binaries using advanced analysis techniques.

readpe

A command-line tool for analyzing and extracting detailed information from Windows Portable Executable (PE) files.