MQL4 to MQL5 This guide will teach you how to port your MQL4 code so that it works in both MT4 and MT5. The goal is to allow you to use the same codebase for both versions and cross-compile between the two. Page Navigation General differences between MQL4 and MQL5 Why port your project to MQL5? 1. It's not as hard as you think Believe it or not, most basic logic and structure from an MQL4 project will compile as-is in MQL5. You just need to know the differences and how to apply them -- most of them are minor, and just a few are significant. And no, OOP is not required. Once you know the rules, it's straightforward to write your code so that it cross-compiles identically with MQL4 and MQL5. You can write changes just once and they work the same in both versions. The version-specific code is kept minimal and easy to section off from the main code. This guide will cover what changes you'll need to make. 2. MT5 is practically the same as MT4 This wasn't always true. You may have heard that trading in MT5 is restrictively different from MT4 because it only allowed for one trade direction

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