Free online · No signup · 100% local

STEP to USDZ converter

Drop your .step / .stp file — we convert it to .usdz right in your browser. Files never leave your computer.

⇪
Drop your STEP file here
Accepts .step / .stp · converts to .usdz

STEP vs USDZ— what's the difference?

STEP.step / .stp

ISO 10303 boundary-representation CAD format — the industry standard for exchanging precise, parametric solid models between engineering tools.

Strengths
  • Exact curved surfaces (NURBS / B-rep) — no tessellation loss
  • Assembly hierarchy, part names and metadata preserved
  • Supported by every major MCAD tool (SolidWorks, Inventor, Fusion, Creo, NX…)
  • Open, vendor-neutral ISO standard
Limitations
  • Not directly consumable by 3D printers or game engines
  • Files are larger and slower to open than mesh formats
  • Requires a CAD kernel to read — no native browser support
Typical use: Engineering CAD exchange, mechanical design, supplier handoff
USDZ.usdz

Apple's AR-native package format — a zipped USD scene that iOS Safari renders directly via AR Quick Look without any app install.

Strengths
  • Native iOS AR Quick Look (tap → floating 3D in your room)
  • PBR materials + animations preserved
  • Single self-contained file, easy to email or link
Limitations
  • Android / desktop need a separate path (typically GLB)
  • Tooling outside Apple's ecosystem is still catching up
Typical use: iOS AR product previews, retail, museums, e-commerce

How to convert STEP to USDZ

  1. 1
    Drop a .step or .stp file. The CAD kernel runs in WebAssembly locally — nothing uploaded.
  2. 2
    Preview the tessellated model in 3D. Check the Scene Tree to confirm the hierarchy is right.
  3. 3
    Click Download .USDZ. Share the file via AirDrop, iMessage, or link — tapping on iPhone launches AR Quick Look.

FAQ

What is USDZ good for?

USDZ is Apple's native AR format. Drop the file in iCloud / Dropbox / any web link, and tapping it on an iPhone launches AR Quick Look — your model floats in the room with no app install required. Great for product previews, retail, and client presentations.

Does it work on Android?

No — USDZ is iOS-specific. For Android, convert STEP to GLB instead (we have a landing for that too) and use Scene Viewer.

How do I trigger AR Quick Look from a website?

Host the .usdz file and link it with an anchor: `<a rel="ar" href="model.usdz"><img src="preview.jpg"></a>`. Safari on iOS intercepts the click and launches AR. The main 3D viewer here does exactly this — load a STEP, export USDZ on an iPhone, and it launches AR automatically.

Is my CAD uploaded anywhere?

No. STEP is parsed by occt-import-js in your browser; USDZ is generated locally by Three.js' USDZExporter.

How big will the USDZ be?

Typically 1–5× the source STEP depending on tessellation density. USDZ compresses the zipped USD payload efficiently.

Related converters

STEP → GLBSTEP → STLSTEP → OBJFBX → GLB