The short definition
A trade copier is software that watches a source (a MetaTrader account, a signal channel, an alert feed) and repeats each trading action on one or more target accounts. When the source opens EURUSD, the targets open EURUSD; when the source moves its stop, closes half or closes the rest, the targets do the same.
The useful part is not the repeating, it is the translating. The target may be at another broker, on another platform, with a different balance, a different account currency and different symbol names. A good copier works out the right symbol and lot size for each target, applies the target owner's own rules, and keeps the two sides linked until the trade is closed.
What a copier actually copies
| Source action | On the target |
|---|---|
| Opens a market position | Opens a position in the same direction, sized by the target's lot mode |
| Places a pending order | Places the same pending order (if pending copying is on) |
| Moves SL or TP | Moves the linked trade's SL or TP (when SL/TP are copied as is) |
| Closes part of a position | Closes the same share of the linked volume |
| Closes the position | Closes the linked trade |
Notice that the copier copies actions, not results. Your trade fills at your broker's price, pays your spread and swap, and is sized for your account. Profit on the source and profit on the target will be close in percentage terms but never identical.
Local EA copiers, cloud copiers and broker social trading
There are three common ways to copy trades on MetaTrader.
Local copier (EA on your terminals)
A master EA runs on the source terminal and writes trades to a file or a local connection; a slave EA on each target terminal reads them and places orders. It is fast when everything sits on one machine, but every terminal must stay open, so in practice you rent a VPS and keep it updated. If the VPS restarts, copying stops until someone notices.
Cloud copier
The copier connects to the broker servers directly with the account credentials, so nothing runs on your computer and no terminal has to stay open. This is how CopyTraderTool works: you add accounts in a browser, on desktop or phone, and the copier keeps running on our servers when your devices are off. The trade-off is that you trust the service with the account login, which is why the source only needs a read-only investor password and stored passwords are encrypted.
Broker social trading, PAMM and MAM
Some brokers offer copying inside their own platform, or let a manager trade pooled or allocated accounts. These only work inside that one broker and on its terms. A standalone copier works across brokers and platforms and you keep full control of each account.
The path of one copied trade
- The source broker reports a new position to the connected session.
- The copier matches the source symbol to the target's symbol list (
GOLD→XAUUSD.m). - It calculates the lot size from the target's settings and rounds it to the target broker's lot step.
- It applies filters: direction, time window, news pause, max open trades, max slippage, max signal age.
- It sends the order to the target broker and stores the link between the two trades.
- Later modifications and closes on the source are matched through that link.
Each step takes time. Inside a cloud copier the processing is usually tens of milliseconds; the larger, uncontrollable parts are the brokers' own reporting and execution. See slippage and latency explained.
Why sizing is the most important setting
The single most common copying mistake is copying lots one-to-one from an account that is much bigger than yours. A copier offers several ways to size: proportional to balance or equity, a fixed multiplier, a fixed lot, or a percentage risk based on the stop. The lot sizing modes guide explains each with numbers; the lot size calculator lets you test them.
What a copier can't do
- It can't make a losing strategy profitable. It reproduces the source, including its drawdowns.
- It can't give you the source's exact fills. Different brokers have different prices, spreads and execution.
- It can't withdraw money. A trading password can open and close trades, but withdrawals happen in your broker's client area with a different login.
- It can't know your prop firm's or broker's rules. Staying within them is your responsibility, though tools such as drawdown protection help.
A checklist before you copy anything
- Start on a demo target, or with a small live account, for at least a couple of weeks.
- Choose a sizing mode on purpose and set a max lot cap.
- Add a drawdown rule on the target account before the first trade.
- Send a test trade and read the result in the copy history.
- Review the copy history weekly: rejected and skipped trades tell you what to fix.