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|description=The most complete tool for modding, decompiling and unpacking Undertale (and other Game Maker: Studio games).
|description=The most complete tool for modding, decompiling and unpacking Undertale (and other Game Maker: Studio games).
|author=krzys-h
|author=krzys-h
|lastupdated=2024/08/24
|lastupdated=2026/04/29
|type=Hack Utilities
|type=Hack Utilities
|version=0.6.1.0
|version=0.9.0.0
|license=GPL-3.0
|license=GPL-3.0
|downloadraw=[https://github.com/krzys-h/UndertaleModTool/releases/tag/bleeding-edge Bleeding Edge] - [https://github.com/UnderminersTeam/UndertaleModTool/releases/tag/0.6.1.0 Stable Download]
|downloadraw=[https://github.com/krzys-h/UndertaleModTool/releases/tag/bleeding-edge Bleeding Edge] - [https://github.com/UnderminersTeam/UndertaleModTool/releases/tag/0.9.0.0 Stable Download]
|website=https://gamebanana.com/tools/6647
|website=https://gamebanana.com/tools/6647
|source=https://github.com/krzys-h/UndertaleModTool
|source=https://github.com/krzys-h/UndertaleModTool
|donation=
|donation=
}}
}}
<!--undertalemodtoolnx.7z-->
The most complete tool for modding, decompiling and unpacking Undertale (and other Game Maker: Studio games).
The most complete tool for modding, decompiling and unpacking Undertale (and other Game Maker: Studio games).


Line 68: Line 69:


==Changelog==
==Changelog==
'''0.6.1.0'''
*Changed
**The RunSwitchOnPC.csx script now helps with running the Switch and Xbox versions of Undertale on PC. It has thus also been renamed to RunSwitchAndXboxOnPC.csx
*Fixed
**Fixed the EmSize field on font assets always being loaded as the number 0, in games where it was a floating point number.
**Fixed GameMaker version 2023.1 getting misdetected when loading, due to some unnecessary leftover code.
'''0.6.0.0'''
*Added
**Added GameMaker 2023.4, 2023.6, 2023.8, and 2024.2 support.
**Added GameMaker 2022.0.2+ LTS support.
**Added partial save/load support for GameMaker 2024.6.
**The GUI will now show extension options from GameMaker 2022.6.
**A new tooltip explains what the asset index shown in the bottom right corner means.
**Profile mode support has been added for GameMaker 2.3+ games.
**YYSWF support has been added for GameMaker 2022.1 games
**The "ImportGMS2FontData" script is now able to handle font data from GameMaker 2023 IDEs.
**A "TouchControlsEnabler" script has been added, which allows enabling touch controls in an Undertale game.
**Added Spine sprite support for GameMaker 2023.1.
**Struct support has been added.
*Changed
**The "ImportGraphics" script has been changed to accept sprites with zero-padded indices (e.g. spr_abc_001.png).
**The "SpriteOriginCopy2_3" script has been removed, as its behavior was merged into the "SpriteOriginCopy" script.
**The "ApplyBasicGraphicsMod" script will no longer tell you that image dimensions are not the proper size, as the check for it was faulty.
**The "NewTexturePacker" script has been improved to bin pack better, as well as have the ability to change the bin sizes for both dimensions.
**Decompiling and disassembling code entries will now be slightly faster and use a lot less RAM.
**The "ImportAllEmbeddedTextures", "ImportAllStrings", "ExportAllStrings", "ExternalizeAllOGGs", and "ExportAllSounds" scripts are no longer Windows-only.
**The "TTFFonts" script now makes it clearer that it's only meant for Undertale.
**Removed redundant .NET localization folders (e.g. "cs", "de", "es"...) for the non-single file version.
**When failing to fetch a localization comment for Undertale or Deltarune, it is now shown as // <localization fetch error>.
**More assets in Deltarune will now be shown correctly rather than as numbers.
**When using scripts with the CLI, the "Newtonsoft.Json" library is now added as a reference.
**The "ExportAllSprites" script will now ask you if you want each sprite in a subfolder.
**The "DebugMsg" script can now be used again.
**A message box is no longer shown when saving a profile for profile mode.
**Updated GitHub URLs to point to the new organization's version of the repository.
**Some discrepancies between Debug and Release builds have been removed, when loading data files.
**The Git commit hash is now shown in the title bar of bleeding edge builds produced by GitHub Actions.
**Exception messages in the GUI, as produced by C# scripts, have been improved to look better with multiple scripts in the stack trace.
**The line numbers in search results are now clickable.
**API: Multiple public lists now have a setter.
**API: Add a lot more documentation.
**API: Small documentation revisions made to some models in the library.
*Fixed
**UTMT will no longer duplicate function names.
**UTMT will no longer randomly crash when attempting to save.
**The "ImportGMLFile" script will not prompt you to enter an object name when importing collision event scripts.
**UTMT will no longer sometimes open an incorrect tab, as opposed to the one you clicked on.
**UTMT will no longer scroll the tab view if the current tab is already fully visible.
**Some code entries which contained switch statements will no longer freeze the decompiler.
**The CLI will no longer crash when attempting to dump code from a YYC game.
**The warning that appears when a file has unexpected padding will no longer be shown in the CLI, when verbose is off.
**Fix edge case where pasting new code on top of a code entry that had an exception in its output will crash UTMT.
**Fix UTMT crashing in certain cases when exporting a room as a PNG ("ExportAllRoomsToPng.csx").
**Adding a new shader now properly allows you to edit it.
**The disassembly tab will no longer freeze on large code entries.
**UTMT will now properly discover GameMaker 2.3+ runtimes.
**When decompiling code, return statements will now be properly shown again.
**When decompiling certain code entries, parentheses will now be placed to prevent inaccurate decompilation.
**Fix decompilation errors from code entries using the Boolean type introduced in GameMaker 2.3.7.
**Fix an edge case where compiling a code entry that had boolean expressions inside of a binary operation would cause games to crash.
**Detecting GameMaker 2.2.2.302 no longer fails on certain edge cases.
**Fixed cases where games using shaders and bytecode 13 would not load correctly.
**Fixed background/tileset parsing for bytecode 12 games.
**Renamed the ClearDisplayBuffer flag to DoNotClearDisplayBuffer, as that's what it's actually doing.
**Fix the font size being inaccurately saved as whole numbers.
**Fix the CLI crashing when a warning or an error has occurred.
**Fixed an edge case where the built-in updater would crash.
**When using profile mode, fetching localization comments for Undertale or Deltarune will not endlessly append them.
**Allow some GameMaker 1.0.0.1250 games, which used builtin audio groups, to load.
**Fix a regression that led to GameMaker 2.3.1 detection not working correctly in some games.
**Fix external textures producing warnings when loading data files.
**Fix false-positive GameMaker 2022.1 version detection, which led to some early 2.3 games failing to load.
**Fix GameMaker 2.0.6 version detection occurring too late in the load process.
**Fixes in the decompiler involving parentheses and correctness of the right sides of arithmetic.
**Fix C# scripts being unable to use relative paths when using the #load preprocessor.
'''0.5.1.0'''
Additions:
* The dark mode setting (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1141 #1141], [https://github.com/krzys-h/UndertaleModTool/pull/1121 #1221], *[https://github.com/krzys-h/UndertaleModTool/pull/1273 #1273], [https://github.com/krzys-h/UndertaleModTool/pull/1336 #1336], [https://github.com/krzys-h/UndertaleModTool/pull/1342 #1342]).
* Tabs content state saving and restoring (tab sessions) (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1152 #1152]).
* More ways of opening an object in a new tab (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1232 #1232]).
* The "Find all references" feature and the new "Find" menu: (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1246 #1246])[0].
* Allows you to search for references of any common type asset by right-clicking:
** An asset in the main list.
** An object reference in the "Object definition" fields.
** A tile on the GMS 2 tileset image (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1288 #1288]).
** A texture page item on the embedded texture image (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1293 #1293])[0].
* A support for the tile layer exported data (.csv) from "Tiled" (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1280 #1280])[0].
* A proper support for code with multiple functions (@Jacky720, @VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1191 #1191]).
* Proper code editors for shaders (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1294 #1294]).
* A support for sequence text tracks (GM 2022.2 - e.g. "Dono’s Tale") (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1197 #1197]).
* New scripts - "SpriteOriginCopy.csx", "SpriteOriginCopy2_3.csx" (@fixdude in [https://github.com/krzys-h/UndertaleModTool/pull/1144 #1144]).
* A support for GM 2023.1 games (e.g. "HoloCure", "Alien XENOCIDE") (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1206 #1206]).
* A support for some GMS 2.0 games (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1205 #1205], [https://github.com/krzys-h/UndertaleModTool/pull/1239 #1329]).
* A support for GM 2023.2 games (and particle systems) - e.g "The Slormancer", "Nova Drift" (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1238 #1238], [https://github.com/krzys-h/UndertaleModTool/pull/1353 #1353], [https://github.com/krzys-h/UndertaleModTool/pull/1361 #1361]).
* An indication for the sub-functions cache building on first decompilation and 3 minutes timeout for it (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1241 #1241]).
* Proper sequence model names for debugging and the "Find all reference" results (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1254 #1254]).
* A support for games with room path layers (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1256 #1256], [https://github.com/krzys-h/UndertaleModTool/pull/1268 #1268]).
* A possibility to delete room objects through context menu (@zivmaor, @VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1301 #1301]).
* The "Run other script..." option on missing "Scripts" folder (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1364 #1364]).
* An option to export one sprite with padding (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1367 #1367]).
Fixes:
* A memory leak of UTMT scripts and the command box (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1220 #1220]).
* A bug with textures not being displayed in GM 2022.3+ games; improvements of an "ImportGMS2FontData.csx" script (@Dobby233Liu, @Miepee, @VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1048 #1048]).
* A bug with <code>PromptChooseDirectory()</code> infinite loop in CLI (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1183 #1183]).
* An "ExportAllRoomsToPng.csx" script error (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1164 #1164]).
* A crash in CLI version on events replacing (@TheAwoo in [https://github.com/krzys-h/UndertaleModTool/pull/1174 #1174]).
* A "Texture failed to loaded!" error in the embedded texture editor (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1199 #1199]).
* An extension file and function tab titles display (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1200 #1200]).
* A room background definition removing (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1202 #1202]).
* A crash in "Deltarune 1&2" after a "Ch2 Debug.csx" script (@Jacky720 in [https://github.com/krzys-h/UndertaleModTool/pull/1188 #1188]).
* The "Gdip" crash in CLI version on loading GM 2022+ games (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1302 #1302]).
* An annoying XAML binding error in "Visual Studio" log (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1228 #1228]).
* <code>Environment.ProcessPath</code> warnings in "Visual Studio" (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1234 #1234], [https://github.com/krzys-h/UndertaleModTool/pull/1258 #1258]).
* A bug in the code editor that led to freezes on some errors (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1243 #1243]).
* The "FindUnusedStrings.csx" script (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1246 #1246])[1].
* A rare crash on drag&dropping within the asset list and the tab panel (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1264 #1264], [https://github.com/krzys-h/UndertaleModTool/pull/1289 #1289]).
* A crash on the tileset image click (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1274 #1274]).
* Incorrect GMS 2 rotated/flipped tiles display (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1280 #1280])[1].
* A bug that broke the "Disassembly" code editor tab on some localizations, e.g. Turkish (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1298 #1298]).
* A random <code>SaveCodeChanges()</code> crash on data saving (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1304 #1304]).
* A rare crash on opening the "Disassembly" code tab (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1322 #1322]).
* A crash on invalid entered color value (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1357 #1357]).
Changes:
* The version flags cleanup and proper GM(S) version in the title (@Jacky720, @Miepee, @VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1047 #1047]; @VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1213 #1213]).
* Game data loading is noticeably faster and uses less RAM (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1161 #1161]).
* Made the embedded texture image zoomable and more interactable (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1293 #1293])[1].
* A lot of the font editor improvements: (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1328 #1328], [https://github.com/krzys-h/UndertaleModTool/pull/1331 #1331], [https://github.com/krzys-h/UndertaleModTool/pull/1332 #1332], [https://github.com/krzys-h/UndertaleModTool/pull/1346 #1346]).
** Added the red marker for the selected glyph, made the font texture clickable.
** Made the glyphs table show and accept actual characters.
* ... and more! See the PR description.
* Disabled room layers are highlighted with gray color (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1201 #1201]).
* The "Timestamp" value (in "General info") is in human-readable format (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1226 #1226]).
* An optimization of the "data.win" file context menu options - e.g. "Run game normally" (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1245 #1245]).
* An optimization of "ExportAllCode2_3.csx" script (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1239 #1239]).
* Room object names improvements (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1246 #1246])[2].
* Made the room instance layer objects resolving safer - adds a support for a "Pizza Tower D3 v3.1" mod and "Heroine Conquest" (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1266 #1266], [https://github.com/krzys-h/UndertaleModTool/pull/1299 #1299]).
* Made the GMS debugger related things more distinguishable from the debug mode in some games; the GMS debugger file option is hidden by default (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1330 #1330]).
* Improved the object reference fields clarity (@VladiStep in [https://github.com/krzys-h/UndertaleModTool/pull/1363 #1363]).
[https://github.com/krzys-h/UndertaleModTool/releases Release notes.]
[https://github.com/krzys-h/UndertaleModTool/releases Release notes.]


Latest revision as of 03:57, 3 May 2026

UndertaleModTool
General
Authorkrzys-h
TypeHack Utilities
Version0.9.0.0
LicenseGPL-3.0
Last Updated2026/04/29
Links
Bleeding Edge - Stable Download
Website
Source

The most complete tool for modding, decompiling and unpacking Undertale (and other Game Maker: Studio games).

Features

  • Can read every single byte from the data file for lastest version of Undertale, Deltarune, and most other GameMaker: Studio games (GM:S 1.4 and GMS2 bytecode versions 13 to 17 are currently supported) for every platform and then recreate a byte-for-byte exact copy from the decoded data.
  • Properly handles all of the pointers in the file so that if you add/remove stuff, make things longer/shorter, move them around etc. the file format won't break.
  • An editor which lets you change (almost) every single value, including unknown ones.
  • Includes a simple room/level editor.
  • Allows for code disassembly and editing. This means you can add any custom code to the game, either using the built-in GML compiler or GML assembly.
  • Experimental high-level decompiler. The output is accurate (except for the latest GameMaker versions), but it could use some more cleaning up of the high-level structures.
  • Support for running scripts that automatically modify your data file (or perform other nefarious tasks) - this is the way to distribute mods, but creating them is a manual job for now. It also serves as a replacement for sharing hex editor offsets - if you make it into a file-format-aware script instead, there is much smaller change of it breaking after an update.
  • All core IO functionality extracted into a library for use in external tools.
  • Can generate an .yydebug file for the GM:S debugger so that you can edit variables live (see here).
  • Automatic file associations for all GameMaker related files. This can be disabled by having a dna.txt file next to the executable.

User guide

UndertaleModTool has different builds per release. The differences are as follows:

  • .NET bundled - Bundles the required .NET runtime version needed to run the tool alongside it. All stable releases are .NET bundled, so you don't have to worry about installing the necessary runtime.
  • Single file - The tool is only one executable, with all dependencies embedded within it. This does make your folders cleaner, however it also causes some unexpected stability issues.
  • Non-single File - All dependencies are not embedded within the executable, but are now located right next to it. Choose this if you don't care about finding the right executable in-between of ~300 dll's, or if the stability issues from the Single file build affect you.

Some test scripts are included:

  • Universal:
    • Search - Basic text search within decompiled code entries.
    • Scripts to batch import and export various types of asset files.
  • Undertale only:
    • EnableDebug - Activates Undertale's debug mode by enabling the global variable 'debug' at game start.
    • DebugToggler - Allows toggling the debug mode on and off with the F1 key.
    • BorderEnabler - Facilitates the importation of PlayStation exclusive borders into the PC version, while ensuring proper display by patching version checks.
    • Testing - Displays random text on the main menu, this was the first script ever created.
    • TTFFonts - Makes the game load fonts in TTF format from current directory instead of using the spritesheet fonts. You'll need to provide the font files yourself.
    • RoomOfDetermination - Adds a new room to Undertale 1.08. Although incomplete, it serves as a comprehensive example of adding content.
  • Deltarune only:
    • DeltaHATE - HATE-inspired script for corrupting Deltarune
    • DeltaMILK - Replaces every non-background sprite with the K.Round healing milk. Don't ask why.
    • TheWholeWorldRevolving - Creates a spinning effect.
  • Undertale and Deltarune only:
    • GoToRoom - Replaces the F3 button's debug mode functionality with a dialog allowing you to jump to any room by its ID.
    • ShowRoomName - Displays the current room name and ID on the screen during debug mode.

Additionally, there are some community-made scripts. For more information, consult the SCRIPTS.md file.

Documentation is available on UndertaleModTool wiki.

Screenshots

undertalemodtoolnx2.png

Undertale: Bits and Pieces
undertalemodtoolnx3.png

RIBBIT - The Deltarune Mod
undertalemodtoolnx4.png

Changelog

Release notes.

External links

Retrieved from "https://www.gamebrew.org/index.php?title=UndertaleModTool_Switch&oldid=204779"

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