No. You need a decompiler. There is no hidden "Save as MQ4" option in MT4.
To understand the conversion, you must understand the difference between the two file states:
The compilation process is designed to be a one-way street. Think of it like baking a cake: you can easily turn ingredients (source code) into a cake (executable), but you cannot turn a baked cake back into eggs, flour, and sugar.
Run the EX4 on a demo account. Observe its inputs, outputs, and behavior. Then write your own MQ4 from scratch that mimics the logic. This is legal and teaches you more than any decompiler. How To Convert Ex4 To Mq4 Free
Converting an EX4 to MQ4 without permission is:
Even if you succeed technically, you cannot legally sell, share, or use that decompiled code commercially.
Attempting to convert these files for free carries significant risks that often outweigh the benefits: The compilation process is designed to be a one-way street
This is the only legal and safe free method. Many developers (especially on MQL5 Marketplace or free code bases) provide the MQ4 source upon request or as part of the purchase.
How to do it:
Success rate: High, if the developer is active and agreeable. Even if you succeed technically, you cannot legally
Even with the best free decompiler, the output MQ4 will have these fatal flaws:
| Original MQ4 Feature | After Decompilation |
|----------------------|----------------------|
| Meaningful variable names (RSI_Value) | var_1, var_2, var_300 |
| Comments explaining logic | All comments removed |
| Clean loops and conditions | Goto statements and spaghetti logic |
| Proper function structures | Broken or missing functions |
| Compiles successfully | Fails to compile |
You will spend more time fixing the decompiled mess than writing the strategy from scratch.