Convert your MT4 EA to MT5, with a report of every difference
Brokers are moving to MetaTrader 5, and an MT4 Expert Advisor does not run there. FXNook AI Code Lab converts MQL4 EAs and indicators to MQL5, keeps the trading logic, compiles the result and tells you exactly what changed.
Why MT4 code does not run on MT5
MQL5 is a different language model, not a newer version of MQL4. MT4 trades with orders (OrderSend, OrderSelect, OrderClose); MT5 trades with positions and deals through the CTrade class. MT4 indicators return values directly (iMA, iRSI); MT5 indicators are handles you create once and copy values from. Arrays, time series and account functions differ too. A line-by-line rename does not work.
How the Lab converts
- Reads the whole program first: inputs, functions, order handling, indicators and the files it includes.
- Checks the dependencies: an include or library that is missing is reported before anything is converted, with what happens if you continue.
- Converts with the trading logic kept: entry rules, exits, money management and filters behave as in the original wherever MT5 allows.
- Compiles the MT5 code with MetaEditor and repairs what the compiler reports.
- Checks the strategy against the original, rule by rule, and lists the differences that change behaviour.
- Saves the result as a new version; your MT4 original stays as it was.
An honest conversion report
Some MT4 behaviour has no exact MT5 equivalent, for example hedging on a netting account, order-based tickets, or some chart functions. The Lab never hides that: the report lists unsupported features, behavioural differences and anything you must check by hand, so you can test with confidence.
Long and complex EAs
Large EAs are converted in parts that run side by side, each saved as it is finished, so a long program converts reliably. The price in credits is shown before the job starts.
Questions
Can every MT4 EA be converted to MT5?
Most can. Some features have no exact MT5 equivalent, and compiled .ex4 files cannot be converted without their source code. The conversion report lists anything that differs.
Will the converted EA trade exactly like the MT4 version?
The Lab keeps the trading logic and checks it rule by rule, but MT5 executes trades differently (positions instead of orders, netting or hedging accounts). Test the MT5 version in the Strategy Tester and on a demo account before trading live.
Can I convert an .ex4 file?
No. An .ex4 file is compiled; the Lab needs the .mq4 source code. If you only have the .ex4, ask the author for the source or an MT5 version.
What happens to my original MT4 code?
Nothing. The converted program is saved as a new version; the original stays in the project, read-only.