: Most websites or software claiming to be "free decompilers" in 2026 are often broken, unreliable, or potentially malicious. Many produce "junk" code with random variable names and illogical structures that won't run. Build Limitations : Tools like EX4 to MQ4 Decompiler 4.0.432 only work for files compiled with Build 509 or lower
If you want to attempt a conversion, here are the primary paths:
If you only need to use the indicator's data in another Expert Advisor (EA), use the iCustom function in MQL4 to pull values directly from the EX4 file without needing the source code.
If the indicator or EA uses standard technical indicators (like Moving Averages, RSI, or MACD), you can look up open-source equivalents on the MQL5 Code Base. You can often piece together the logic yourself for free by studying basic MQL4 programming tutorials. Step-by-Step: How to Safely Recreate an EX4 File how to convert ex4 to mq4 free work
Most EX4 files today are compiled with Build 600 or newer. These use advanced compilation techniques that transform code into high-level rather than byte code.
If you cannot decompile the file, consider these "workaround" options:
: There is no safe, legal, or reliable "free tool" that converts modern EX4 files back to MQ4 source code. : Most websites or software claiming to be
MetaTrader 4 uses two primary file formats for its scripts, indicators, and Expert Advisors (EAs).
Software decompile ex4 to mq4 - Soacinena1972's Site on Strikingly
Do you know roughly or MT4 build the file was created in? If the indicator or EA uses standard technical
Sites like Forex Factory sometimes have community members who may help with older, non-protected files. A New Feature: "Logic Mapper"
: If your EX4 was compiled with a very old version of MT4 (Build 509 or lower), legacy software like the PureBeam Decompiler might still work, but these are rarely found safely today. Reverse Engineering Platforms : Advanced users utilize tools like
If you are looking to get an Expert Advisor or indicator modified: You Can't Convert EX4 to MQ4 (Stop Wasting Time)
What or feature are you trying to implement? Share public link
On MQL5 Freelance or Upwork, you can pay $50–$200 to recreate an EA's logic from scratch. You get original, clean MQ4 code that you own.