There is no mainstream, fully functional, free, and safe GMS2 decompiler that works on all games with a simple installer. The only semi-reliable free tool requires manual compilation from source code and only works on specific game versions.
Even if such a tool did exist, using it on commercial games is illegal and unethical. You risk legal action, community blacklisting, and infecting your computer with malware.
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If a GameMaker decompilation tool is not hosted on an open-source platform where the code can be publicly audited, do not download or install it. How to Protect Your Own GMS2 Games From Decompilers
Many downloadable ".exe" files claiming to be decompilers are simply empty programs wrapped in a user interface designed to make you click ads or complete surveys to unlock "features" that do not exist. Safe Practices for Reverse Engineering GameMaker Games game maker studio 2 decompiler free install
For a game with 100 objects, this takes 10+ hours.
Understanding game structures to create community-made mods or patches. Top Free GameMaker Studio 2 Decompilers (2026) There is no mainstream, fully functional, free, and
If you are a developer worried about others decompiling your game, here are practical steps: