// Unity Editor script for batch GLB to VRM conversion using UniVRM10; using System.IO;
Start with a properly rigged, T‑pose GLB model that has at least basic BlendShapes and uses compatible materials (MToon or PBR). Then follow the step‑by‑step conversion workflow in your tool of choice. Finally, test your avatar in its intended application —this is the only way to be absolutely sure your conversion succeeded.
is a specialized extension of glTF built specifically for humanlike avatars.
Go to and load your model.
Most professional avatars are finalized in Unity. This method is the most reliable for ensuring compatibility across VTubing software like VSeeFace or Luppet. convert glb to vrm high quality
Drag your high-quality GLB model into the Unity Asset folder.
Before touching any software, you must understand why a naive conversion fails.
Use online converters only for placeholder or test avatars. Never for a production VTuber model or commercial asset.
Drag your .blend file (or exported FBX) into Unity. // Unity Editor script for batch GLB to
Use Blender’s Decimate modifier on high-poly garments before exporting to GLB. 3. Texture Atlasing
: Go to File > Export > VRM (.vrm) . Ensure "Validate VRM Model" is checked to catch any hidden topology or rigging errors before the file writes. Step 3: Preserving Visual Quality (Shaders & Textures)
This workflow is perfect when you have a model that is already animation‑ready and you just need to convert it quickly.
Blender is a free, open-source 3D creation suite. The VRM Add-on for Blender is a powerful, widely-used tool for importing, editing, and exporting VRM files, making it the ideal choice for creators who want to inspect and modify their model pre-conversion. The VRM Add-on essentially turns Blender into a one-stop shop for avatar creation. is a specialized extension of glTF built specifically
| Tool | Purpose | Quality Level | |-------|---------|----------------| | (3.6+) + VRM addon | Manual retargeting & material bake | ★★★★★ | | Unity + UniVRM | Automated but configurable export | ★★★★☆ | | VRoid Studio (for humanoids) | Re-rigging from scratch | ★★★☆☆ | | glTF to VRM CLI (Python) | Batch processing with validation | ★★★☆☆ |
GLB typically uses Metallic/Roughness maps. VRM uses MToon (a Unity shader).
Download the from GitHub (available as a .zip archive).