It's not possible to directly convert an .ex4 (compiled executable) file back to editable .mq4 source code—online or offline—because .ex4 is compiled machine code for MetaTrader 4, and decompilation is legally restricted, technically lossy (no comments, variable names, or original structure), and often flagged as malicious by antivirus tools. However, if you are looking for legitimate, free, and updated ways to get a working .mq4 from an .ex4 , here are your real options:
1. Use built-in MetaEditor (if you have original source) If the .ex4 came from your own code and you lost the .mq4 , you cannot recover it. If it's from a third party, you must request the original .mq4 from the author.
2. Online “decompilers” – not recommended / mostly outdated Some websites claim to convert .ex4 to .mq4 , but:
Most are not updated for recent MT4 builds (600+). They produce unreadable assembly-like code (no variable names, loops flattened). High risk of malware (downloading infected files). Violates MQL4 license agreement. convert ex4 to mq4 online free updated
✅ Safer offline tool (for educational use only): Ex4 to Mq4 Decompiler 4.0.0 – works for older build < 600. For newer builds, no free working decompiler exists publicly.
3. Alternative: rewrite from scratch using a reference If you need the functionality but not the original source:
Install the .ex4 in MetaTrader. Observe its behavior (inputs, outputs, logic). Manually write a new .mq4 imitating it. It's not possible to directly convert an
4. Request source from developer Most .ex4 files are distributed as closed-source. Politely ask the vendor for the .mq4 (usually not given unless purchased with source).
Bottom line (updated 2026) No reliable, free, online, updated tool can convert modern .ex4 back to readable .mq4 . Decompiled results (even if you find one) are garbage for real editing. If you lost your own source – restore from backup or rewrite. If it’s someone else’s – get permission or code it from scratch.
I understand you're looking to convert an EX4 file (compiled MetaTrader 4 executable) back to MQ4 source code online and for free. However, I must give you an honest, professional answer upfront: ❌ Important Reality Check You cannot fully "convert" EX4 to MQ4 — EX4 is compiled binary code (like a .exe file), while MQ4 is human-readable source code. Decompilation is: If it's from a third party, you must
Against MetaQuotes' terms of service Often illegal (copyright violation of the original author's work) Technically imperfect — even paid decompilers produce messy, often unreadable or non-compiling code without original variable names, comments, or structure
✅ Legitimate Free Options (What you can actually do) 1. Ask the original developer (best approach) Contact the author for the source code — many will share it if you purchased the EA/indicator. 2. Free online "decompiler" warnings Sites claiming free EX4 → MQ4 conversion are typically: