Install Unity
Download and install Unity (recommended version is 2019.4.x).
Import UniVRM
Download the latest version of UniVRM (.unitypackage file) and create a new Unity project.
Drag the downloaded UniVRM package into Unity to import it.
Import the FBX Model
Drag the FBX model into the Assets folder in Unity.
Set Animation Type
Select the imported model, and in the Inspector window, set the “Animation Type” to “Humanoid,” then click “Apply.”
Check Bone Configuration
Click the “Configure…” button to check if the bones are correctly configured. Ensure there are no red-marked bones; if there are, corrections need to be made.
Export as VRM
In the Hierarchy window, select the model, then from the menu select VRM > UniVRM > Export humanoid.
Fill in the author information, click “Export,” choose the save location, and complete the export[5].
Both methods effectively convert FBX files to VRM format. Depending on personal preference and tool availability, you can choose the method that suits you best for conversion.