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SPECIFICTION
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UAssetGUI

github.com

Free plan WindowsLinux
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Spec score 7.8 #12 of 25 in Game Modding Tools

What it is

UAssetGUI is a desktop tool for examining and modifying Unreal Engine game assets by hand. It supports .uasset, .umap, .usmap, .utoc and .ucas files, as well as JSON. Windows is supported directly; Linux setup runs the Windows executable through Wine. Command-line arguments can export and import UAssetAPI JSON without opening the graphical interface, and custom C# scripts can extend the program. Portable mode, available in v1.1.0 or later, keeps configuration and saved mappings in a Data folder beside the executable. The v1.1.0 release added opening and saving .utoc and .ucas containers through built-in retoc integration. Pre-built binaries and an experimental build are available from the repository’s Releases page. Release notes report support for Unreal Engine 5.6 and 5.7, while earlier notes identify limits for some Unreal Engine asset support. UAssetGUI is free under the MIT License, which provides the software without warranty. The maintainer announced retirement from UAssetGUI development, though future contributors or releases might follow.

Spec sheet

Purpose
UAssetGUI is a tool for low-level examination and modification of Unreal Engine game assets by hand.Read 8 Oct 2026 · github.com
Intended users
The repository describes the tool as for low-level, hands-on examination and modification of Unreal Engine game assets.Read 7 Oct 2026 · github.com
Support
The project invites bug reports through its issues page and says reports for assets that fail binary equality need sample assets, game name, Unreal Engine version, and mappings file if needed.Read 7 Oct 2026 · github.com
License
The project is distributed under the MIT License, which permits use, copying, modification, distribution, sublicensing, and sale subject to its stated conditions.Read 7 Oct 2026 · github.com
Command line
Command-line arguments support tasks such as exporting assets to UAssetAPI JSON and importing JSON without opening the GUI.Read 8 Oct 2026 · github.com
Compatibility limit
The v1.0.0.0-alpha.8 release notes say Unreal Engine 5 .pak support did not include IO store or Zen assets.Read 7 Oct 2026 · github.com
Container integration
UAssetGUI supports opening and saving .utoc/.ucas containers through built-in integration with retoc.Read 8 Oct 2026 · github.com
Container support
The v1.1.0 release added opening and saving .utoc and .ucas containers through built-in integration with retoc.Read 7 Oct 2026 · github.com
Contributing
Issues about assets that fail binary equality must include test assets, except when the issue is unrelated to asset parsing.Read 8 Oct 2026 · github.com
Contribution policy
The project says it does not accept AI-generated code, text, documentation, or other AI-generated assets in pull requests.Read 8 Oct 2026 · github.com
Customization
UAssetGUI supports custom scripts written in C# to extend program behavior.Read 7 Oct 2026 · github.com
Downloads
Pre-built binaries are available from the repository’s Releases page, with an experimental build published with each new commit.Read 8 Oct 2026 · github.com
Extensibility
Custom scripts written in C# can extend the program’s behavior.Read 8 Oct 2026 · github.com
License and warranty
The software is distributed under the MIT License, which provides it “AS IS” without warranty.Read 8 Oct 2026 · github.com
Limits
The README says Linux setup uses Wine, and the release notes identify some support as rudimentary or limited, including support for UE 5.4/5.5 in an earlier release.Read 8 Oct 2026 · github.com
Linux
The project describes Linux setup through Wine and lists Wine 11.0 as the version used to test the instructions.Read 7 Oct 2026 · github.com
Linux support
The project documents running the Windows executable on Linux through Wine and lists tested setup steps.Read 8 Oct 2026 · github.com
Maintainer status
In the v1.0.0.0-alpha.8 release notes, atenfyr announced retirement from Unreal Engine modding and UAssetGUI development, while noting that future contributions and releases might come from others.Read 7 Oct 2026 · github.com
Portable mode
Portable mode stores configuration files and saved mappings in a Data folder next to the executable and is available from v1.1.0.Read 8 Oct 2026 · github.com
Unreal Engine versions
The v1.1.0 release notes report support for Unreal Engine 5.6 and 5.7.Read 8 Oct 2026 · github.com

Plans and prices

UAssetGUI Free MIT-licensed software Read 8 Oct 2026 · github.com

Every UAssetGUI plan and price →

Strong points and limits

Strong points

  • Supports five Unreal asset and container formats plus JSON.
  • Command-line JSON import and export are available.
  • C# scripts can extend program behavior.
  • Opens and saves .utoc and .ucas through retoc.
  • Free under the MIT License.

Limits

  • Linux use requires Wine.
  • Some Unreal Engine asset support has documented limits.
  • The maintainer announced retirement from development.
  • The MIT License provides the software without warranty.

Who it suits

It suits people who need to inspect or modify Unreal Engine game assets, including through command-line JSON import and export or C# scripts. Linux users need to run it through Wine.

Verdict

UAssetGUI offers a specific set of asset formats, command-line JSON handling, and C# customization at no cost. Check its documented compatibility limits and Wine requirement before choosing it.

Where Specifiction places it

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