A: Absolutely not. YouTube is the #1 distribution channel for malware disguised as decompilers. Check the comments – they are likely bots praising the tool.
Assuming you have an EX4 from MT4 Build 509 or older, and you have found a legacy GitHub decompiler (e.g., "ex4_to_mq4_v2.0.exe"): How To Convert Ex4 To Mq4 Free
But what happens when you have a great EA in .ex4 format, but you don't have the source code? Maybe you bought it from a developer who disappeared, or you downloaded a free version online and want to modify it. This creates a demand for converting .ex4 back to .mq4 . A: Absolutely not
Most free "decompilers" only work for very old MT4 builds (e.g., build 509 or lower). Modern builds (build 600+) use stronger encryption and compilation techniques that are virtually impossible to fully decompile into readable code. Obfuscated Results: Assuming you have an EX4 from MT4 Build
99.9% of them are viruses, keyloggers, or password stealers. The remaining 0.1% produce garbage code.
If a software claims to do this for free today, proceed with extreme caution. Modern decompilation is an incredibly complex, manual process that requires advanced reverse engineering skills. It is not something a simple, free automated software script can handle.