| If you want to... | Recommendation | |------------------|----------------| | Recover lost source code of your old EA | Unlikely to work for build 600+; try professional paid decompiler (still unreliable). | | Crack a commercial EA | Illegal, unethical, and risky. Don’t. | | Learn how an EA works | Better to find open-source MQ4 examples on GitHub or MQL5 Code Base. | | Modify an indicator without source | Ask the author for permission or pay for custom development. |
MetaQuotes has shifted focus to MetaTrader 5, but MT4 remains popular. As of 2025, newer builds (1420+) use stronger encryption and integrity checks. The era of casual, free one-click decompilation is effectively over. Free Ex4 To Mq4 Decompiler Software Applications
Explain how to use the to write your own script from scratch. | If you want to
On platforms like Upwork or ForexFactory's "Programming" section, experts will decompile modern E2E for $50–$200. They use commercial tools (e.g., EX4 to MQ4 Decompiler from ex4tomq4.net, which costs $299). Paying a professional is often cheaper than the time waste of broken free tools. Don’t
Decompilers must reconstruct loops, conditionals, and function calls from linear bytecode. Free tools use naive pattern matching. Professional decompilers (e.g., Hex-Rays for C++) use advanced graph algorithms. Free EX4 tools use neither—they produce "spaghetti code" with goto statements everywhere.
Online "decompiler services" frequently request payment but fail to deliver working source code for modern EX4 files. Alternative Solutions Instead of decompiling, consider these legal paths: Ex4-to-mq4-decompiler-4.0.392.1 - Facebook