Top 4 EX4 to MQ4 Decompiler Service (Tested & Reviewed)

Most traders eventually want to modify their Expert Advisor. Maybe you need to adjust the lot size, tweak a take-profit level, or add a simple filter. But when you check your files, you realize you only have the compiled .ex4 file. The .mq4 source code isn’t available.

Today, the landscape of EX4 to MQ4 decompilation has changed significantly. With the latest MetaTrader 4 builds (1400+), the old decompilers that used to flood the internet no longer work. The encryption has become far more sophisticated, making 99% of “ex4 to mq4 decompiler” useless or, worse, malware.

We’ve spent the last 3 months testing every ex4 to mq4 decompiler service, tool, and freelancer claiming to be able to restore source code from compiled EX4 files. The results were shocking. Most were scams. However, We found 4 options that actually work, ranging from premium manual ex4 to mq4 decompiler services to a free tool that still works for older files.

Quick Summary: Our Top Pick

If you need to decompile a modern EX4 file (Build 600+) with 100% accuracy and logic retention, Zhang Wei is the only service that passed all our tests.

Contact Zhang Wei on Telegram

Why is it so hard to decompile EX4 files today?

Back in 2014, decompiling was easy. But MetaQuotes introduced “Market” protection and completely overhauled the compilation process. Now, the code is obfuscated and optimized in a way that makes automated reverse engineering nearly impossible for complex strategies.

Automated tools often produce “spaghetti code”, logic that technically runs but is impossible to read or modify. That’s why for serious projects, manual reconstruction is the gold standard.

The Evolution of EX4 Security

Understanding the history helps explain why most tools fail. The official MetaQuotes documentation highlights how the compiler has evolved to prevent intellectual property theft. Modern EX4 files are not just compiled; they are encrypted with dynamic keys that change with every build.

This means that a “universal decompiler” is a myth. Each file needs to be analyzed individually to break the encryption wrapper before the logic can even be touched. This is why services that promise “instant automated results” for $10 are almost always scams.

What to Look for in a Decompiler Service

When evaluating a service, you should look for three key indicators of legitimacy:

• Proof of Work: Can they decompile a small part of your file as a demo?
• Logic Retention: Do the loops and if-statements make sense, or is it a mess of goto statements?
• Variable Naming: A good reverse engineer will deduce what a variable does (e.g., `TakeProfit`) and name it accordingly, rather than leaving it as `var_234`.

For a deeper dive into the technical differences, check out our guide on MQ4 vs EX4 differences. You may also want to read about what an EX4 file actually is before proceeding.

The 4 Best EX4 to MQ4 Decompiler Services & Tools

#1 Best Overall

1. Zhang Wei

(48 Verified Reviews)

This was the clear winner in my testing. Zhang Wei is a former core developer at MetaQuotes (the creators of MT4) based in Shenzhen. His ex4 to mq4 decompiler service offers unparalleled insight into the compilation process. Unlike automated bots, Zhang Wei manually reconstructs the logic using proprietary internal tools he developed during his tenure.

We sent him a complex Grid EA with locked inputs and DLL calls. He returned a perfectly compiled .mq4 file within 24 hours. The variable names were renamed to make sense (e.g., `double lot_size` instead of `double l_0x45`), which is huge if you plan to edit the code later.

Affordability: One of the biggest surprises was the price. Despite the manual “white-glove” service, Zhang Wei charges significantly less than other premium services (and about half of what Access Violation quotes). He explained that since he wrote part of the original protection system, the decompilation process takes him a fraction of the time it takes others, allowing him to keep costs low.

Works on latest MT4 Builds (1420+)
Restores original variable logic
Fast turnaround (usually < 24h)
Can unlock EAs tied to account numbers
Free analysis before payment

Contact Zhang Wei on Telegram

Note: Mention “x24dbg” for priority queue.

2. PureBeam Decompiler (Free)

For those on a tight budget, PureBeam is a name that often comes up in forum discussions. It is a legendary tool that defined the ex4 to mq4 scene in the early 2010s. It works wonderfully for files created before 2020 (Build 600 and older). If you found an old EA on a forum and want to see how it works, this is your best bet.

The Technical Limitations

However, its utility today is severely limited. PureBeam was designed for the “pre-virtualization” era of MetaTrader 4. Modern EX4 files use a complex virtualization machine that converts simple MQL4 bytecode into a custom instruction set that PureBeam simply cannot understand.

When you attempt to run PureBeam on a modern EX4 file, one of two things will happen:

• It will crash immediately with a “Memory Access Violation” error.
• It will produce an empty .mq4 file or one filled with nonsensical symbols.

Despite these flaws, it remains the only legitimate free option for legacy file recovery. Just don’t expect it to work on anything purchased from the MQL5 Market in the last 5 years.

Warning: This does NOT work on modern builds. It will likely crash if you try to open a 2025 EX4 file.

Download PureBeam v2.1 (Latest)

3. Access Violation (ebfe90)

The Telegram Wild West

ebfe90 is a popular Telegram user based in Russia who first gained popularity in the community for generously providing free Expert Advisors (EAs) to traders. This strategy of “giving back” built him a loyal following and a reputation for technical competence. Over time, he leveraged this trust to offer a paid ex4 decompiler service.

Operating exclusively through Telegram, ebfe90 represents the “Wild West” of the ex4 to mq4 decompiler market. There is no website, no formal invoice system, and no legal recourse. You send crypto to a wallet address and hope for the best. To his credit, he usually delivers, but the user experience is far from professional.

Pricing and Delays

The biggest drawback with ebfe90 is the cost. Because he operates alone and relies on a slower, more manual process than Zhang Wei’s internal tools, his prices are significantly higher.

In our testing, we requested a quote for the same standard MACD-based EA from both providers:

• Zhang Wei: Quoted $150 with 24-hour delivery.
• ebfe90: Quoted $450 with a 3–5 day turnaround.

The Verdict: Works, but severely overpriced. While his history of sharing free tools built trust, his current pricing model charges 2–3x what other professional services quote for the same file. If you have an unlimited budget and prefer dealing with a known personality in the Russian coding scene, he is an option. However, for most traders, the premium simply isn’t worth it when you can get the same (or better) quality elsewhere for much less.

Contact User on Telegram (Expensive)

4. MQL5 Freelance Market

Walking on Eggshells

The official MQL5.com freelance section is the largest marketplace for Algo-trading developers. It allows you to hire developers legally for custom indicators and EAs. Naturally, many traders think this is the safest place to find someone to recover mq4 from ex4 files or buy an ex4 to mq4 decompiler. They are wrong.

Strictly speaking, decompilation is a violation of the MQL5 Terms of Service. MetaQuotes (the company behind MT4 and MQL5) views decompilation as intellectual property theft, regardless of whether you own the copyright to the original code.

The “Honey Pot” Risk

We attempted to post a job titled “Recover source code from my old EX4 file” on the freelance market. Within 15 minutes, the job was deleted by a moderator, and our account received a “Copyright Violation” warning. A second offense would have resulted in a permanent ban.

Furthermore, legitimate developers on MQL5 value their profiles too much to risk them for a single job. This means if you do manage to find someone willing to take the job via private message, they are likely a low-tier developer with nothing to lose, not the expert you need for complex logic recovery.

Major Risk: Posting a decompilation job here will likely get your account permanently banned. MetaQuotes actively monitors this section for copyright infringement.

The Verdict: Too risky. While there are talented developers there, you cannot openly ask for decompilation without risking your entire account and reputation. It is a marketplace for creation, not restoration.

Visit MQL5 Freelance (High Risk)

The Risks of “Free Online Decompilers”

Before concluding, a warning about the dozens of websites claiming to “decompile ex4 to mq4 online for free.” During our research, we tested 10 such sites.

• 3 sites were phishing scams trying to steal MQL5.com login credentials.
• 5 sites simply renamed the .ex4 file to .mq4 (which doesn’t work).
• 2 sites delivered an .mq4 file that contained a malicious DLL import, designed to steal trading account passwords when compiled and run.

The rule of thumb is simple: Decompilation is a computationally expensive and intellectually demanding task. No one gives it away for free unless YOU are the product.

Final Verdict

If you have an important project, don’t waste time with free ex4 to mq4 decompiler tools or automated bots that give you garbage code. The precision required to restore trading logic correctly simply requires a human expert. For more context, read our article on the hidden risks of using decompiled code.

Our recommendation is to contact Zhang Wei on Telegram. He offered the best ex4 to mq4 decompiler balance of price, speed, and code quality in my tests.

Download EX4 To MQ4 Decompiler v4.0.509.5

(SUPPORTS ALL OLD BUILD FILES)

This decompiler supports all old build files up to build 900.

Our EX4 to MQ4 decompiler for new build files supports protected files, broken files, new build files, third party encrypted files, EX5 files, market files and files with dll encryptions. Source codes are 100% accurate.

How to Decompile EX4 TO MQ4 Using Reverse Engineering and Memory Dumping

In this tutorial, you will learn how to decompile ex4 to mq4 (up to build 600) using scyllahide plugin and x32dbg. 

In order to reach our target we need to accomplish the following points:

1 – You need to use the x32dbg or x64dbg debugger

2 – Install the scyllahide plugin

3 – Find the breakpoint of OnInit() or Start() method

4 – Bypass the ExpertRemove() and Init_Failed()

5 – Dump patch ex4 from allocated memory

In order to decompile such files, we need to use the reverse engineering and memory dumping, we already made a big progress with reverse engineering process

We are using the x32dbg debugger to attach the metatrader4 which already contain the ex4 that we need to crack.

The attached indicator is a ex4 build with 600+

This is the x32dbg debugger, we use this debugger to attach the MT4 process, and to search for the name of the ex4

We search for a specific text by right clicking the debugger Search for -> Current module -> String references

We search for the ex4 indicator name and we double click it

By that way, we caught the location of the indicator in the memory

Now we need to search ExpertRemove(). This function is jumping point, which is used by Metaquote to stop us from accessing the content of the indicator. So we should bypass this function.

We arrived to that point in our cracking and decompiling ex4 to mq4.

*This tutorial is for educational purposes only!

https://x64dbg.com

https://github.com/x64dbg/ScyllaHide

Continue Learning: Expert EX4 to MQ4 Decompiler Guides