WebAssetStudio

WebAssetStudio is an online tool to view and extract game asset bundles, inspired by Perfare's AssetStudio (archived). It runs entirely inside your browser using JavaScript and WebAssembly.

This tool and its creator, sponsors, and users are not affiliated or endorsed by Unity or any other company with a supported product.

Supported formats

WebAssetStudio currently supports the following formats:

• UnityFS (.unity3d, .assets, level*)
• FSB5 (currently only for UnityFS bundles)
• XNA/FNA serialized assets (.xnb, .xnb.deploy)
• Godot bundles (.pck) (beta)
• GZip-compressed versions of the formats listed above

Planned support

WebAssetStudio plans to eventually support the following formats:

• Wwise BNK (.bnk)
• Unreal bundles (.pak) and assets (.uasset, .ubulk, etc)

Feel free to suggest formats as GitHub issues.

Exporting

Currently, only ZIP exporting is supported, as well as downloading files individually by selecting the object and clicking the "Download object" (for the significant converted data) or "Download info" (for the object properties) button below the preview.

A guide to the ZIP directory layout is as follows:

│
└ <filename>
  ├ Externals: details of external files used by the asset
  │  └ <guid>.json
  ├ Objects: the actual objects of the asset (e.g. textures, meshes, sprites)
  │  ├ <object>.<extension>: An exported asset (e.g. .png, .gltf, .shader [note 1])
  │  └ Info: all properties of each object (to a reasonable degree)
  │    └ <object>.json: A JSON file containing properties of the object
  ├ Reference types: type trees used as references
  │  └ <typename>_<scriptID>.json: A type tree, in JSON form
  └ Type trees: type definitions used by objects - these might be inaccurate
     └ <typename>_<scriptID>.json: Same as above

Note 1: Shaders contain a raw shader structure and aren't exported at the moment. (TODO)

Supported classes (Unity)

These Unity classes are currently supported:

• Animation
• AnimationClip
• Animator
• AnimatorController
• AnimatorOverrideController
• AssetBundle
• AudioClip
• AudioListener
• Avatar
• Behaviour
• CanvasRenderer
• Component
• Cubemap
• EditorExtension
• FlareLayer
• Font
• GameObject
• Material
• Mesh
• MeshFilter
• MeshRenderer
• MonoBehaviour
• MonoScript
• NamedObject
• ParticleSystemRenderer
• PhysicMaterial
• PPtr (note 1)
• Renderer
• RuntimeAnimatorController
• Shader
• SkinnedMeshRenderer
• Sprite
• TextAsset
• Texture
• Texture2D
• Transform

Note 1: In this implementation, PPtrs do not explicitly declare a type. The type is inferred by the resolved path.

Credits

• AssetStudio
• mikunyan
• Crunch
• UnityCrunch