VRM vs FBX vs glTF: VTuber File Formats Explained (2026)

Your 3D VTuber rigger asks: "VRM, FBX, or glTF?" The answer depends on which app you're streaming with — VSeeFace wants VRM, Unity wants FBX, web apps want glTF. Here's the cheat sheet.

If you commission a 3D VTuber model and the rigger asks "what file format?" — and you stare blank — here's the practical guide.

Quick answer (skip if you want details)

Streaming with	Use this
VSeeFace, Warudo	VRM
VRChat	VRM (then convert with VRC SDK)
Unity / Unreal game	FBX
Web (Three.js, A-Frame)	glTF or GLB
Blender editing	FBX (best round-trip)
iPhone AR	USDZ (you can convert from glTF)

VRM — the VTuber standard

VRM is built on top of glTF and adds VTuber-specific metadata: meta info (creator, license), spring bones (hair/clothing physics), and 52 blendshape mappings (BlendShape Clip system).

Pros: Works in 90% of VTuber streaming apps out of the box (VSeeFace, Warudo, VTube Studio 3D, etc.). Includes license metadata so people can't steal your model and claim it.

Cons: Game engines don't natively read VRM (need plugins). File size is medium.

Sub-versions: VRM 0.x is the original; VRM 1.0 (released 2022) is what most modern tools support. Always commission VRM 1.0 in 2026.

FBX — the game engine standard

Autodesk's FBX is what 3D tools have used for 25+ years. Universally readable in Maya, Blender, 3ds Max, Unity, Unreal.

Pros: Best for game integration. Preserves all rigging, animations, and morph targets.

Cons: Closed format (Autodesk owns it). Bigger file size. No VTuber-specific metadata.

Get FBX if you're putting your VTuber INTO a video game (e.g. an indie game where your character is the protagonist).

glTF / GLB — the web standard

glTF (GL Transmission Format) is the open-standard 3D format optimised for web delivery. GLB is just the binary single-file version (better for distribution).

Pros: Tiny file size. Streams over web fast. Open standard. Works in Three.js, Babylon.js, Web XR, and increasingly in native apps.

Cons: No VTuber metadata (you need VRM for that). Less rigging detail than FBX.

Get glTF if your VTuber is showcased on a website (your portfolio, a 3D landing page, an interactive demo).

Other formats you might hear about

• USDZ: Apple's AR format. iOS Quick Look uses it. Convert from glTF with Apple's reality-converter.
• USD (Universal Scene Description): Pixar's open format, increasingly used in pro pipelines.
• OBJ: Ancient. No animation, no rigging, just geometry. Avoid.
• STL: 3D printing only. Useless for VTubers.

What to ask your 3D commission rigger

When you commission a 3D VTuber model, request these in the quote:

1. Primary deliverable: VRM 1.0 (always, for streaming use)
2. Source file: FBX with full rigging (so you can re-export later)
3. Optional: GLB if you have a website to showcase on
4. Optional: VRChat-ready Unity package if you plan to use VRChat

Reputable riggers include all 4 in their Premium tier. Cheap riggers might give you only the VRM and charge extra for source files. Always ask upfront.

Common pitfalls

• "Send me the source" after delivery — by then, the rigger has moved on. Get sources upfront.
• VRM 0.x in 2026 — many tools have dropped support. Insist on VRM 1.0.
• FBX without animations — verify the FBX includes idle, walk, dance, expression animations if you commissioned them.
• Single binary VRM with no PSD — you can't edit the model later. Always get the layered source.

What AnimArts ships

Every 3D VTuber model commission includes:

• VRM 1.0 (primary streaming file)
• FBX with full rig + animations (Blender / Maya / Unity ready)
• GLB for web embedding
• Source Blender file (.blend)
• Texture set (PNG, fully unwrapped)
• VRChat-ready package on Premium tier and up

Commission a 3D VTuber model →