Convert STL to USDZ Online — Free
Upload a Stereolithography file and download it as Universal Scene Description (Zip). Runs entirely in your browser — no server uploads.
About These Formats
Stereolithography
STL stores only triangulated geometry — no colors, textures, or animations. It is the de-facto standard for 3D printing slicers and CAD software.
Used with
3D printing slicers (Cura, PrusaSlicer, Bambu Studio), CAD tools, rapid prototyping workflows.
Universal Scene Description (Zip)
USDZ is Apple's zipped USD format for augmented reality. It is the native format for iOS/macOS AR Quick Look, enabling users to place 3D objects in the real world.
Used with
iOS AR Quick Look, Safari, Shopify AR, Apple Vision Pro, and e-commerce AR previews.
What Transfers from STL to USDZ
A breakdown of which data survives the STL-to-USDZ conversion.
3D Geometry
Vertices, faces, and normals always transfer
Textures & Materials
STL contains no texture data
Animations
STL does not store animations
Vertex Colors
STL does not support vertex colors
Multiple Objects
STL stores a single mesh
When to Convert STL to USDZ
Convert STL to USDZ when you need an Apple AR Quick Look experience. USDZ is the native 3D format for iOS and macOS — users can tap a link in Safari to place your model in the real world. It is also supported by Shopify, Reality Composer, and Apple Vision Pro.
STL to USDZ — What to Know Before Converting
For reliable iOS AR Quick Look, keep polygon count below 100,000 triangles and limit texture atlases to 1024 × 1024 or 2048 × 2048 px. Models above these limits may load slowly or fail on older iPhone and iPad hardware. USDZ does not support per-vertex colors — bake vertex colors to a texture before converting if your source relies on them.
Other STL Conversions
Tips for the Best STL to USDZ Result
Test on a real iOS device via AirDrop or a direct Safari link — desktop USDZ viewers do not always match AR Quick Look's rendering.
Use Apple's free Reality Converter (macOS) to validate and preview the USDZ before publishing.
For Shopify AR, upload both a GLB (served to Android) and a USDZ (served to iOS) — Shopify selects the correct format automatically.
USDZ supports only one UV channel. Models with multiple UV sets should be baked to a single channel before converting.
Common Reasons to Convert STL to USDZ
- →iOS AR Quick Look: letting Safari users place the 3D model in their real-world environment with a single tap — no app required
- →Shopify AR: Shopify natively serves USDZ to iOS and GLB to Android; upload both for full cross-platform AR coverage
- →Apple Vision Pro: spatial computing apps built with RealityKit and Reality Composer Pro use USDZ as their primary format
- →iMessage and AirDrop: iOS users can share USDZ files directly and recipients see an interactive 3D preview inline in Messages
Frequently Asked Questions
How do I convert STL to USDZ?
Upload your .stl file using the tool above, confirm the source format is set to STL and the target is USDZ, then click Convert. The file processes in your browser and you can download it immediately.
Does converting STL to USDZ preserve textures?
Yes. Converting to USDZ preserves PBR materials and embedded textures from the source file.
Is this converter free?
Yes, completely free. No account, no usage limits, no hidden fees.
Are my files uploaded to a server?
No. All processing happens locally in your browser using WebGL. Your files never leave your device.