The best way to "convert" is to never lose your source code:
I see this question asked daily: "How do I convert an EX4 file back to MQL4?"
. It is important to distinguish between the two formats: an how to convert ex4 file to mql4
A well‑known MQL5 forum moderator explains: “Modern MQL4+ and MQL5 use more native code and are encrypted. They can still be cracked by someone highly knowledgeable, but they can no longer be decompiled (only disassembled, which is something completely different)” .
Can you easily convert an EX4 file to an MQL4 file? 1. Old MT4 Builds (Before Build 600) The best way to "convert" is to never
If you only need to use an indicator's data in another Expert Advisor (EA), you can use the iCustom function in MQL4 to pull values from the .ex4 file without needing the source code.
Run the EX4 file in the MT4 Strategy Tester in visual mode. Note exactly when it opens trades, how it calculates stop losses, and how it manages trailing stops. Can you easily convert an EX4 file to an MQL4 file
Some are referring to very old EX4 files (pre‑2014) that used a less secure format. Others are scammers trying to sell fake services. A few are using disassembly (producing assembly code, not MQL4) and misrepresenting it as decompilation. Be very skeptical of any claims of successful modern EX4 decompilation.