No legitimate, fully functional online converter exists.

This is the most updated advice for 2025: Many coders on MQL5.com or ForexFactory will give you the MQ4 file if you provide proof of purchase. If the product is free, they often share the source code openly.

If you search for "EX4 to MQ4 converter online," you will typically encounter three types of results:

These older files were easier to decompile. Tools like EX4 to MQ4 Decompiler 4.0.432 were once effective for these legacy files.

Before trying to convert files, it is vital to understand what these formats actually are: