MMD to VRM converter — Japanese bones read as they are

Try it with two test files

We cannot hand you somebody else's MMD model: almost every one forbids redistribution. So these two are PMX files we built ourselves, from one of our own avatars, with Blender's mmd_tools and the standard MMD bone and morph names. They are not models from the MMD community. Each archive sits next to the VRM this page's converter wrote from it, untouched. Upload either zip above and you should get the same numbers.

To look at a PMX before converting it — these two or your own — the PMX viewer opens it in the browser with its textures and morph sliders, without uploading anything. Open the PMX viewer →

Converted on 10 October 2026 by the code this page runs: Blender 4.5.13 with mmd_tools 4.5.14 reads the PMX, our own writer produces the VRM 0.x. The PMX side of each table was read with mmd_tools' PMX parser and the VRM side straight from the file; height and width are taken after the skeleton is applied to the mesh, not from the raw vertices. We built the PMX files with mmd_tools and did not open them in MikuMikuDance itself. How VSeeFace, Warudo or VNyan draw the result was not measured here.

What did not carry over

• —Physics. Sample B goes in with four rigid bodies and three joints and comes out with no colliders and no spring bones. The strap's three bones are still in the file and its mesh is still skinned to them, so it moves with the hips, but nothing makes it swing. Hair and skirts on a real model get the same treatment.
• —IK. The four leg IK bones arrive as ordinary bones outside the humanoid. Nothing in the VRM drives them and they drive nothing.
• —Morphs that are not vertex morphs. The bone morph and the group morph are gone. The two vertex morphs the group pointed at are still there, and Joy happens to use the same two. The material morph is the exception: it became an expression that shows the glasses.
• —Sphere map, toon ramp and outline. All three are dropped, and every material is written as plain glTF shading. The strap keeps its flat colour and loses its highlight.
• —The rest pose. The converter straightens the limbs into a strict T-pose, so neither VRM is a vertex-for-vertex copy: both come out 7.8 mm taller and 20 mm wider across the fingertips than their PMX.
• —Presets these samples have no morph for. Neutral is written empty, and Fun and the four look directions are not written at all.
• —What a tidy sample cannot show. We wrote these files, so every bone and morph has the name the converter expects. A real model adds twist bones, dozens of physics chains and morphs under its author's own names; a clean result here is not a promise about your file.

Both samples are one of our own avatars, published under CC BY 4.0, re-rigged and exported to PMX by us with mmd_tools — use them, modify them, redistribute them with credit. More free avatars →

PMX and PMD are read directly — zip the model with its tex/ folder

Upload the .pmx itself: since September 2026 the converter reads PMX and PMD directly, no Blender export needed. It maps the bones, carries the materials and textures over and shows the result in a 3D preview before download. センター, 上半身, 腕 and the rest are read exactly as the model author wrote them, in both the raw MMD spelling and the Blenderized one.

Zip the model folder as it came: the .pmx (or .pmd) together with its textures — MMD distributions keep the images in a tex/ folder next to the model, and the model only points at them by filename. A distribution with several costumes holds several .pmx files; the converter lists them and asks which one to convert. Textures in PNG, BMP and TGA all work; sphere maps (.sph/.spa) and MMD's shared toon ramps are dropped, and a material without a texture keeps its colour.

MMD's standard morphs become VRM expressions: あ・い・う・え・お drive the mouth, まばたき and ウィンク the blinks, 笑い, 怒り and 困る the emotions. Morphs that move face bones instead of vertices — common on game-rip models — do not carry over, so those models arrive without expressions, like an FBX would. Rigid bodies and joints are not converted: the VRM comes out without spring bones, so hair and skirts do not swing on their own.

One thing the converter cannot check for you: most MMD models ship a readme with the author's terms, and many forbid converting the model to other formats or using it outside MikuMikuDance. Read it before you convert, and keep the result to yourself unless the terms say otherwise.

Exports still work too. If you already have an FBX or glTF of the model from Blender's mmd_tools, zip it with the tex/ folder and convert that; both bone-name shapes are recognized, raw MMD's side prefix (左腕) and the .L/.R suffix mmd_tools writes when it Blenderizes a rig (腕.L).

Why 下半身 is not the hips

In an MMD skeleton 上半身 and 下半身 are siblings under センター, not a chain. So the VRM hips slot goes to センター, and 下半身 is left out of the humanoid on purpose: giving it the hips would put the spine outside the hips subtree and break the VRM hierarchy the apps rely on.

It is worth knowing because the converter's report lists unmatched bones, and 下半身 will be among them on a correctly converted model. That is the intended outcome, not a missing bone.

MMD bone names the converter maps

Left side shown; the right side is the same word with 右 instead of 左 (or the .R suffix). Where a joint has two common writings, both resolve to the same VRM bone.

左肩 and 右肩 take the shoulder slots, 目 the eyes, and the finger chains are read too: 親指 thumb, 人差指 (also written 人指) index, 中指 middle, 薬指 ring, 小指 little, numbered outwards from the hand. Both the hiragana and kanji writings of the elbow and knee resolve, and so do both side conventions, so a model that went through mmd_tools converts the same as one that did not. Verified on real files in our regression corpus. On a successful conversion the result panel names what it recognized: “mmd rig”.

What can go wrong with a MMD file

A conversion that cannot finish tells you which of these it hit, and returns the credit — you are never charged for a failure.

Frequently asked questions