As a common phenomenon among Forex traders, using programmed indicators plays an important role in the analysis of trading against the market. Decompile MQL4 indicator Forex is no exception in taking advantage of the convenient and rapid trading approach created by automation. This article seeks to provide traders with an in-depth understanding of the decompilation process when it comes to the MQL4 indicator Forex. Unfortunately, it is not possible to decompile an MQL4 indicator for use in Forex trading. This is because MQL4 is a protected language and all code written in it is encrypted. Without access to the original source code, it is impossible to reverse engineer the program and recreate it for use in Forex trading.