Comprehensive Tool for Undertale Modding

UndertaleModTool is a versatile application designed for modding, decompiling, and unpacking Undertale, as well as other games developed with Game Maker: Studio. This free utility offers a user-friendly interface that allows users to easily manipulate game files, enabling them to create custom modifications and enhancements. With features tailored for both beginners and experienced modders, it simplifies the process of exploring and editing game content.

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The tool supports a range of functionalities including decompiling game assets, editing scripts, and unpacking game data. This makes it an essential resource for anyone interested in game development or modding within the Game Maker ecosystem. Whether you're looking to tweak gameplay mechanics or enhance visual elements, UndertaleModTool provides the necessary tools to bring your creative ideas to life.

App specs

  • License

    Free

  • Version

    0.8.4.1
  • Latest update

  • Platform

    Windows

  • OS

    Windows 11

  • Downloads

    234

    Last month's downloads

    • 31
  • Size

    96.95 MB

  • Developer

Program available in other languages



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Laws concerning the use of this software vary from country to country. We do not encourage or condone the use of this program if it is in violation of these laws.
Softonic

Is UndertaleModTool safe?

100/100

Score result: Clean

This file passed a comprehensive security scan using VirusTotal technology. It is safe to download.

  • Virus free
  • Spyware free
  • Malware free
  • Verified by Security Partners

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Scan Info

Last scan
Friday, February 20, 2026
Scan provider
VirusTotal · Full report

File Integrity

File
0.8.4.1.zip
SHA256
fc11002f92cfa9a8ca7a3540f91da1c5d3171b3f4774882a73e82aaba1861639
SHA1
a3a2544767c9617f774241beb1838d23884cf003

Softonic security commitment

UndertaleModTool has been thoroughly scanned by our advanced security systems and verified by industry-leading partners. This file comes from the official developer and has passed all our security checks, showing no signs of viruses, malware, or spyware. For more information, visit our Security and Trust Center