Understanding why you want a decompiler is critical—because the answer changes whether your goal is ethical or not.
In all other cases—decompiling a commercial game you don’t own—is theft.
Download UndertaleModTool from its official GitHub repository (not a random download site). This tool is safe, transparent, and actively maintained.
Many developers actively support modding.
No safe, fully functional, free GMS2 decompiler exists for modern games. The search results you see are mostly scams, malware, or outdated tools that won’t work on games compiled with GMS2.3 or later.
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.
Instead of chasing a broken promise, invest your energy in: game maker studio 2 decompiler free install
Game development is hard, but that’s what makes it rewarding. Decompilation is a shortcut that leads nowhere good. Build your own games, learn from public examples, and respect the work of others.
If you found this article helpful, share it with others who might be searching for dangerous "free install" downloads. Knowledge and ethics are far more powerful than any decompiler.
Disclaimer: This article is for educational purposes. Decompiling software you do not own or have permission to modify may violate laws and licenses. Always consult a legal professional for specific cases.
Decompiling GameMaker Studio 2 (GMS2) games is technically difficult and often restricted by legal agreements. Unlike older versions (like GM8), modern GMS2 games are compiled into complex bytecode or machine code (via YYC), making it impossible to "revert" them into a standard project file with a single click. Available Tools and Projects
While no official "decompiler" exists, the community uses specialized tools to inspect game data or extract assets:
UndertaleModTool: The most popular community tool for modern GMS2 games. It allows users to view and modify the data.win files common in GMS games. It is frequently used for modding popular titles like Undertale and Deltarune. In all other cases—decompiling a commercial game you
Altar.NET (GameMaker-Studio-Decompiler): A GitHub project designed to export parts of a data.win file and disassemble code, though it is primarily for advanced users and developers.
Asset Extractors: Tools like the GMS2-PNG-Decompiler are used specifically to dump visual assets (sprites and backgrounds) rather than the underlying code.
Legacy Decompilers: Older tools like gm81decompiler or GM Decompiler v2.1 only work for legacy versions (GM8.1 and earlier) and are not compatible with GMS2. Technical and Legal Realities
WastedMeerkat/gm81decompiler: GameMaker 8.1 Decompiler - GitHub
I understand you're looking for information about decompiling GameMaker Studio 2 games, but I need to provide an important clarification upfront:
There is no legitimate, free, ready-to-install GMS2 decompiler available publicly. Most tools claiming to be GMS2 decompilers are either: it was created to mod Undertale
If you accept the risks and have a legitimate reason (e.g., recovering your own lost project), here is the safest workflow:
Free decompilers are never perfect. Recovered code is often unreadable:
// Original: if (health <= 0) instance_destroy();
// Decompiled: if (var_local_3 <= 0.0) call_builtin(instance_destroy, 0);
Good luck learning from that.
The most famous GMS2 decompiler is UndertaleModTool (UTMT). Ironically, it was created to mod Undertale, but it works on many GMS1.4 and GMS2 VM games.