Original MQ4 (what you lost):
double CalculateRSI(int period)
double sumUp = 0, sumDown = 0;
for(int i=1; i<=period; i++)
double change = Close[i] - Close[i+1];
if(change > 0) sumUp += change;
else sumDown -= change;
return 100 - (100 / (1 + (sumUp/period)/(sumDown/period)));
Decompiled MQ4 (what you get):
double func_101(int param_1)
double var_1 = 0, var_2 = 0;
for(int local_1=1; local_1<=param_1; local_1++)
double local_2 = Close[local_1] - Close[local_1+1];
if(local_2 > 0) var_1 += local_2;
else var_2 -= local_2;
return 100 - (100 / (1 + (var_1/param_1)/(var_2/param_1)));
As you can see, the logic is identical, but readability is destroyed.
ex4 decompilers on GitHub are powerful research tools that can reveal the inner workings of MT4 Expert Advisors, but they’re imperfect and situational. Expect readable reconstructions for many EAs, especially straightforward ones, while complex, optimized, or protected binaries will require hybrid static/dynamic methods and manual analyst effort. Use these tools responsibly: they’re invaluable for auditing, security research, and recovery—yet they carry legal and ethical responsibilities.
If you want, I can:
The search for an "ex4 decompiler github" is a common journey for MQL4 developers who have lost their source code (.mq4) or traders looking to understand the logic behind a protected expert advisor (EA).
While GitHub is the world’s largest repository for code, finding a working, "push-button" EX4 to MQ4 decompiler there is trickier than it looks. Here is everything you need to know about the current state of EX4 decompilation on GitHub and the risks involved. The Reality of EX4 Decompilation
Before MetaQuotes updated the MT4 platform (specifically after Build 600), decompilers were common. The old EX4 files were essentially obfuscated scripts that could be easily reverted to readable MQ4 code.
Today, it is a different story. Modern EX4 files are compiled into machine code, making 100% accurate decompilation nearly impossible. Most tools you find today are actually "recovery" services or complex hex-editors rather than simple software scripts. What You’ll Find on GitHub
When searching for "ex4 decompiler" on GitHub, you will generally find three types of repositories:
Decompilation Research & Hex Editors: These are legitimate projects by reverse-engineers. They don't "decompile" the code into a readable format but help users view the file's structure or strings. They require high technical skill to use.
MQL4 Protectors: Paradoxically, you will find many tools designed to prevent decompilation. Developers use these GitHub projects to add layers of encryption to their EX4 files.
Outdated/Legacy Tools: You may find repositories containing old code from 2010–2014. These will not work on modern MT4 builds and will likely fail to open your file. The Risks of "Free" Decompilers
GitHub is a trusted platform, but that doesn't mean every script hosted there is safe. Be extremely cautious of: ex4 decompiler github
Malware & Trojans: Since traders often use these tools on machines with sensitive financial data, hackers sometimes upload fake "decompilers" that are actually info-stealers.
Broken Code: Even if a tool works, the output is often "garbage code"—variable names like Var1, Var2, and Var3—making the logic almost impossible to follow without hours of manual reconstruction. Is It Legal?
Decompiling software you didn’t write usually violates the End User License Agreement (EULA) of the product. If you are trying to recover your own lost source code, you are on safer ground. However, using a decompiler to bypass licensing on a commercial EA is illegal in many jurisdictions and unethical in the developer community. Better Alternatives
Instead of hunting for a "magic" GitHub repository, consider these options:
MQL5 Freelance: If you have the EX4 and understand what the bot does, you can hire a developer on the official MQL5 forum to rewrite the logic from scratch in a new MQ4 file.
Version Control: To avoid needing a decompiler in the future, always host your source code (.mq4) in a private GitHub repository. This ensures that even if your hard drive fails, your source code is safe.
While GitHub is a goldmine for MQL4 libraries and indicators, a functional EX4 decompiler is a "white whale." Most repositories you find will either be outdated or highly technical tools for reverse engineers. If you’ve lost your source code, your best bet is often a manual rewrite rather than relying on automated decompilation.
Do you have a specific .ex4 file you're trying to recover, or
Searching for a reliable EX4 decompiler on GitHub can be tricky because most repositories are actually "wrappers" rather than full decompilers, and modern MetaTrader 4 (MT4) builds use advanced encryption that makes clean recovery extremely difficult.
Here is a breakdown of what you will find in popular GitHub repositories and the current state of EX4 decompilation: 1. The "Wrapper" Repositories Many popular GitHub results, such as the ex4_to_mq4_cli project, are not standalone decompilers How they work
: These projects act as a Command Line Interface (CLI) wrapper for old, proprietary decompiler tools (like the famous Purebeam decompiler). Limitation
: They require you to already own the original decompiler executable, which is often outdated and only works on EX4 files from very old MT4 builds (pre-600). 2. Analysis & Pseudocode Tools Newer repositories like Ex4-to-Multiple-Readable-Language-Converter focus on analysis rather than perfect reconstruction.
: These tools attempt to extract metadata, strings, and pattern recognition to generate "pseudocode" in languages like Python or C. Reality Check : While they can help you understand the of a strategy, they rarely produce a "plug-and-play" file that you can immediately recompile. 3. The "2023/2026" Repositories You may see repositories named ex4-to-mq4-2023 or similar. Decompiled MQ4 (what you get): double func_101(int param_1)
: Be wary of repositories that promise "100% recovery" for modern builds. Many are either forks of the old wrapper tools mentioned above or "empty" projects designed to redirect you to paid services. Modern Encryption
: Since MT4 changed how EX4 files are compiled, they are now machine-code based rather than bytecode, making full decompilation nearly impossible for the average user. Summary Table: GitHub Findings Project Type Effectiveness CLI Wrapper ex4_to_mq4_cli Only works for very old builds; requires external Logic Analyzer
Finding a reliable EX4 decompiler on GitHub is tricky because modern MetaTrader 4 (MT4) builds (Build 600+) use advanced encryption and obfuscation that make full decompilation nearly impossible for public tools.
Most GitHub repositories for this topic are either CLI wrappers for older, proprietary decompilers or debugging tools rather than full "one-click" source code restorers. Notable GitHub Projects
Ex4-to-Multiple-Readable-Language-Converter: A modern Python-based tool (requires Python 3.12+) designed to analyze EX4 files. It doesn't just target MQ4; it can attempt to convert logic into Python, C, or R for analysis.
ex4_to_mq4_cli: This is a well-known repository, but it is not a decompiler itself. It acts as a command-line wrapper for the older ex4_to_mq4.exe (which often has to be sourced elsewhere) to automate the process. Essential Context & Warnings
"Wrapper" vs. "Decompiler": Be careful when downloading. Many repositories only contain the "wrapper" code (like this auto-wrapper on GitHub) and require you to already own a separate, often outdated, .exe decompiler.
Modern Limitations: Public decompilers generally only work on EX4 files compiled with Build 509 or older. Files compiled with current MT4 versions (Build 600+) usually require high-end, manual reverse-engineering that isn't available in a simple free tool.
Security Risk: Many "EX4 Decompiler" links found in GitHub issues or discussions point to external sites that may host malware or scams.
Legal Note: Decompiling protected software may violate MetaTrader's terms of service or local copyright laws. How to use a typical GitHub Wrapper If you find a working wrapper like ex4_to_mq4_cli:
Setup: Clone the repository and place the required decompiler executable in the same folder.
Execution: Run the wrapper via command line, passing your EX4 file as an argument.
Output: If successful, the recovered .mq4 source code is typically saved in the same directory. As you can see, the logic is identical,
Are you trying to recover your own lost code, or are you looking to analyze the logic of a specific indicator or Expert Advisor? AI responses may include mistakes. Learn more
GitHub has become the default repository for reverse engineering tools because of its version control, collaborative nature, and ease of distribution. When you search for "ex4 decompiler github", you are looking for open-source or leaked decompilation engines.
Historically, commercial decompilers like EX4 to MQ4 Decompiler (by DmTv) or Ex4Decompiler cost hundreds of dollars. GitHub democratized access. Today, you can find Python scripts, C++ executables, and even web-based decompilers hosted as GitHub Pages.
An Ex4 decompiler is a tool that attempts to reverse engineer compiled MetaTrader 4 (MT4) executable files (.ex4) back into human-readable MQ4 source code. This is often used for recovering lost source code, analyzing malware, or understanding proprietary indicators.
GitHub hosts several open-source and educational projects in this space. Below are notable examples:
Searching for an ex4 decompiler github is a double-edged sword. For the honest trader who lost their source code, it is a lifeline. For the budding reverse engineer, it is a fascinating puzzle in bytecode analysis. But for the code thief, it is a lawsuit waiting to happen.
Before you download that repository, ask yourself:
If you proceed, do so in a virtual machine, never connect to your live trading account, and respect the intellectual property of the developers who keep the algorithmic trading ecosystem alive.
Have a legitimate need to recover an old EA? Consider hiring an MQL4 programmer to recreate the logic from scratch—it often costs less than the legal headache of a decompiler gone wrong.
Further reading:
Here’s a concise, positive review you can post for the GitHub project "ex4 decompiler":
Clear, well-documented, and effective — this ex4 decompiler is impressively polished. The README provides straightforward setup and usage examples, the codebase is modular and easy to follow, and error handling is robust. Performance is solid on a variety of ex4 files I tested, and the author responds promptly to issues. Highly recommended for anyone needing reliable ex4 analysis and conversion tools.
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