Converting (compiled) to MQ4 (source code) via "free online" tools is generally considered impossible for modern versions of MetaTrader 4 . While many sites claim to offer this service, they are frequently identified as scams or malware risks . The Reality of EX4 to MQ4 Conversion
Be extremely cautious: most "online free fix" tools for converting EX4 to MQ4 are either scams or obsolete convert ex4 to mq4 online free fix
Learn MT4’s architecture, back up your source files, and buy EAs from coders who provide source code with purchase. Converting (compiled) to MQ4 (source code) via "free
If you stumble upon a site offering to , proceed with caution. If you stumble upon a site offering to
"Decompile EX4 to MQ4 and fix errors."
If you decide to use an online converter, make sure to choose a reputable service and verify the converted code carefully. Alternatively, consider using a decompiler or contacting the author of the EA or indicator.