Upload an FBX model. AutoRig builds the skeleton and skin, retargets animation clips at once and exports an FBX that imports as a humanoid in Unity and a skeletal mesh in Unreal.
FBX is the interchange format of game engines and DCC tools. An FBX enters the same V3 conveyor as GLB and OBJ: AutoRig builds the skeleton and skin, retargets the animation clips and opens the result in the viewer. If your FBX already has a skeleton or an animation, its own rest pose is read first. The rigged model exports as FBX, and also as GLB, USDZ, a ZIP, a Unity package and a Blender file.
A biped exports with a standard humanoid skeleton that Unity understands.
The same rig imports into Unreal Engine as a skeletal mesh with its animation clips.
No T-pose or A-pose is required. When a biped stands on one leg or steps, the planted leg sets the reference bone lengths.
Your materials, textures and UVs are kept. A model without textures gets PBR maps automatically.

Upload your FBX model and get it rigged for Unity or Unreal Engine. Free to try!
Start FBX Auto Rigging