MetaQuotes actively pursues legal action against decompiler users. Your broker can ban your account for violating the EULA.
or earlier (pre-2014). Since Build 600, MetaQuotes updated its compilation method to generate binary machine code rather than byte code, making clean decompilation via these older tools practically impossible. Broken Code
: Open the generated .mq4 file in a text editor or directly in MetaTrader to review the decompiled code.
These tools are not available on official app stores. They are typically found on various software blogs, file-hosting sites, and forums. A common source mentioned is purebeam.biz , which may require you to register an account to obtain a license key [20†L22-L23].
Verify file
: Even if the software runs, the output is often "spaghetti code" with random variable names, missing logic, and incomplete functions that will not compile in modern MetaEditor. Google Groups Legality and Ethics Intellectual Property (IP)
: The installation wizard will guide you through the process. Typically, you'll need to agree to a license agreement, choose an installation location, and possibly select which components to install.
: An EA or indicator is a piece of software. The code inside it is the intellectual property of its developer. Decompiling that software without explicit permission is typically a violation of copyright law and software licensing agreements [9†L43-L46].
Open the resulting MQ4 in MetaEditor. If successful, you will see code, but it will be:
The EX4 to MQ4 Decompiler is a popular tool among MetaTrader users, allowing them to decompile EX4 files back into MQ4, the source code used to create Expert Advisors (EAs), indicators, and scripts. The latest version, v4.0.4.274, offers improved functionality and compatibility with various MetaTrader platforms. In this article, we'll walk you through the installation process and provide an in-depth look at the features and usage of the EX4 to MQ4 Decompiler.
Download installer