MT4 to MT5 EA Converter — Migrate Your MQL4 Code with AI
You have a working Expert Advisor in MQL4. Moving to MetaTrader 5 means rewriting every OrderSend call, every indicator reference, every trade function. The MQL4 and MQL5 APIs share a similar syntax but differ fundamentally in how orders, positions, and indicators are managed.
Pineify AI converts your MQL4 code to MQL5 automatically. Paste your existing EA, and the converter handles the core API differences — OrderSend to CTrade, iCustom to handles, position iteration — so you get a working MT5 Expert Advisor without manually studying the migration guide.
MQL4 vs MQL5 Core API Differences
These are the most common API mappings the converter handles. Every pattern below is automatically translated so you do not need to manually update each function call.
| Operation | MQL4 | MQL5 |
|---|---|---|
| Open a market order | OrderSend(Symbol(), OP_BUY, lots, Ask, 0, 0, 0) | CTrade trade; |
| Moving Average indicator | iMA(Symbol(), PERIOD_H1, 14, 0, MODE_SMA, PRICE_CLOSE) | int maHandle = iMA(Symbol(), PERIOD_H1, 14, 0, MODE_SMA, PRICE_CLOSE); |
| Select a position | OrderSelect(ticket, SELECT_BY_TICKET) | PositionSelect(ticket) |
| Count open positions | OrdersTotal() | PositionsTotal() |
| Custom indicator | iCustom(Symbol(), PERIOD_H1, "MyInd", param1, 0, 1) | int handle = iCustom(Symbol(), PERIOD_H1, "MyInd.ex5", param1); |
| Close a position | OrderClose(ticket, lots, Bid, 0) | CTrade trade; |
Before and After: Moving Average Crossover EA
See how a simple MA crossover EA changes from MQL4 to MQL5. The logic stays the same — only the API calls are updated.
// MQL4 MA Crossover EA
double maFast, maSlow;
int start() {
maFast = iMA(NULL, 0, 10, 0, MODE_SMA, PRICE_CLOSE, 0);
maSlow = iMA(NULL, 0, 30, 0, MODE_SMA, PRICE_CLOSE, 0);
if(maFast > maSlow && OrdersTotal() == 0) {
OrderSend(NULL, OP_BUY, 0.1, Ask, 3, 0, 0);
}
if(maFast < maSlow) {
for(int i = OrdersTotal() - 1; i >= 0; i--) {
OrderSelect(i, SELECT_BY_POS);
if(OrderType() == OP_BUY)
OrderClose(OrderTicket(), 0.1, Bid, 3);
}
}
return 0;
}// MQL5 MA Crossover EA
CTrade trade;
int maFastHandle, maSlowHandle;
double fastBuffer[], slowBuffer[];
int OnInit() {
maFastHandle = iMA(NULL, 0, 10, 0, MODE_SMA, PRICE_CLOSE);
maSlowHandle = iMA(NULL, 0, 30, 0, MODE_SMA, PRICE_CLOSE);
return INIT_SUCCEEDED;
}
void OnTick() {
CopyBuffer(maFastHandle, 0, 0, 3, fastBuffer);
CopyBuffer(maSlowHandle, 0, 0, 3, slowBuffer);
if(fastBuffer[0] > slowBuffer[0]
&& PositionsTotal() == 0) {
trade.Buy(0.1);
}
if(fastBuffer[0] < slowBuffer[0]) {
for(int i = PositionsTotal() - 1;
i >= 0; i--) {
if(PositionSelect(PositionGetSymbol(i))
&& PositionGetInteger(POSITION_TYPE)
== POSITION_TYPE_BUY)
trade.PositionClose(PositionGetTicket(i));
}
}
}The strategy logic is preserved. The converter updates only the API layer — indicator handles, CTrade class, position enumeration.
Why Migrate from MT4 to MT5
Brokers Are Closing MT4
Many brokers are phasing out MetaTrader 4 in favor of MT5. Migrating your EAs now ensures your automated strategies keep running as brokers transition their infrastructure.
Superior Backtesting Engine
MT5 supports multi-currency backtesting, tick-level precision, and real market depth simulation. The MQL5 tester is significantly more accurate than the MQL4 version for evaluating strategy performance.
64-bit Performance
MQL5 runs natively in 64-bit, allowing access to more memory and faster computation. This matters for EAs with many indicators, large data arrays, or optimization runs across thousands of parameter combinations.
Advanced Order System
MT5 separates orders, positions, and deals into distinct object types. The CTrade class provides netting and hedging models, giving you more control over trade management compared to the legacy OrderSend approach.
More Instruments per Chart
MT5 supports unlimited symbols per chart through Market Watch. EAs can reference multiple instruments, correlated pairs, and synthetic assets from a single chart — not possible in MT4.
Modern Development Tools
MetaEditor 5 includes a debugger, profiler, and better code completion. MQL5 supports object-oriented programming, enums, structures, and namespaces for cleaner, more maintainable EA code.
Convert MT4 EA to MT5 in Three Steps
Paste Your MQL4 Code
Copy your existing MQL4 Expert Advisor file and paste it into Pineify's converter interface. The converter analyzes the full code structure including OnInit, OnTick, and all helper functions.
AI Converts to MQL5
Pineify's AI processes every function call, indicator reference, and trade operation. OrderSend becomes CTrade calls, iCustom switches to handle-based access, and position loops use PositionsTotal and PositionSelect.
Download and Compile MQL5
Download the generated .mq5 file, place it in your MetaTrader 5 Experts folder, and compile in MetaEditor. Run the Strategy Tester to verify the converted EA behaves identically to your MT4 original.
Frequently Asked Questions
Convert Your MT4 EA to MT5 Today
No manual rewrite needed. Paste your MQL4 code and get MQL5 output ready to compile in minutes.
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