While there is no "official" or sanctioned decompiler for GameMaker Studio 2 (GMS2), several community-driven, open-source tools can decompile or extract assets from GMS2 games. Most of these tools target the file found in GMS2 executables. Popular Community Decompilers UndertaleModTool (UTMT)
This is the painful part. Decompilers rarely produce a ready-to-import *.yyp project file. You must manually create a new GMS2 project, re-import each sprite, re-create each object, and paste the recovered GML code. game maker studio 2 decompiler free install
This article is for educational purposes only. Decompiling software without explicit permission from the copyright holder (the game developer) is a violation of the End User License Agreement (EULA) of GameMaker Studio 2 and constitutes software piracy or reverse engineering. This guide explains the technical landscape; you are responsible for your own legal compliance. While there is no "official" or sanctioned decompiler
You can install and use the tool for free by following these steps from the official GitHub repository: Decompilers rarely produce a ready-to-import *
Unzip the folder to a dedicated location on your PC.