UAssetGUI review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

UAssetGUI is an open-source Windows desktop tool for examining, modifying, and saving Unreal Engine game assets. It is aimed at game modders and developers who need direct access to asset data through a graphical interface, with additional command-line and scripting options. Supported formats include .uasset, .umap, .usmap, .utoc, .ucas, and JSON. The tool is free, and its open-source model makes it suitable for users who want to inspect or extend the software as well as edit assets directly.

Its strongest capability is the combination of low-level access and multiple editing paths. Users can open specific asset files graphically, edit raw bytecode, and directly open or save .utoc and .ucas containers. Command-line export to and import from UAssetAPI JSON adds a route for repeatable or externally managed changes, while custom C# scripts can extend program behavior. Portable mode, which uses an adjacent Data folder, also fits workflows where the tool is kept with project files or moved between locations.

Platform fit is the main practical consideration. Windows is the primary environment, while Linux use is documented through Wine, and the project file targets Windows Forms on Windows. UAssetGUI is therefore a focused choice for users working specifically with Unreal asset structures and comfortable with low-level data editing. Those seeking broad, engine-agnostic mod management or a workflow centered on higher-level game content tools should look elsewhere. For Unreal-focused work involving containers, JSON exchange, bytecode, or custom scripts, its free and open-source approach offers considerable scope without a paid tier.

UAssetGUI pros and cons

• Where it wins
  • Modifies and saves Unreal assets, including .uasset and .umap files
  • Works with .utoc and .ucas containers and supports raw bytecode editing
  • Adds CLI JSON exchange, custom C# scripts, and portable mode
• Where it doesn't
  • Windows is the primary platform; Linux use requires Wine
  • Low-level editing may require Unreal asset and bytecode knowledge
  • Focused on Unreal assets rather than broader game modding workflows

UAssetGUI fact sheet, pricing and score →

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Last updated 7 Oct 2026 · How we research and update