Convert STL to USDZ - Free Online Converter
Drop a .stl file below and download it as .usdz in seconds. The conversion runs entirely in your browser - no upload, no signup, no watermark. Preview any print file at real size in AR on an iPhone before you commit filament.
Updated July 2026
Done in seconds
Your STL converts to USDZ locally in your browser - no upload queue, no waiting.
Private by design
Your file never leaves your device. Nothing is uploaded, nothing is stored.
Free, no strings
No signup, no watermark, no file limit - convert as many files as you need.
How to convert stl to usdz
Drop your STL file
Drag the .stl file into the converter above or click to browse. No account and no upload - the file stays on your device.
Conversion runs in your browser
The model is parsed and rewritten locally, in seconds for typical files. Geometry is carried over 1:1 - no remeshing, no quality loss.
Download the USDZ
The .usdz download starts from the same spot. Convert as many files as you like - there is no limit or watermark.
STL and USDZ, explained
What is STL?
STL is the oldest and most universal 3D printing format. It describes a model as a plain list of triangles - nothing else. No colors, no materials, no units, no object names. That simplicity is exactly why every slicer, CAD tool, and print service on earth accepts it.
An STL file stores each triangle as three corner points plus a facet normal, either as compact binary (the common case) or human-readable ASCII. Because the format carries no unit information, almost every tool assumes millimeters. When a file needs to work absolutely anywhere, STL is still the safe answer.
- Developed by
- 3D Systems (1987)
- Structure
- Binary or ASCII list of raw triangles
- Used by
- Every slicer, CAD package, mesh-repair tool, and 3D-printing marketplace
What is USDZ?
USDZ is Apple's AR format: Pixar's Universal Scene Description packed into a single file that iPhones and iPads open natively in AR Quick Look - no app required. E-commerce product previews on Apple devices run on USDZ.
USDZ shines on Apple platforms and almost nowhere else, so the common workflows are converting a GLB into USDZ to ship an AR preview, or unpacking a USDZ back into GLB/OBJ to edit it in standard tools.
- Developed by
- Apple + Pixar (2018)
- Structure
- Uncompressed ZIP around Pixar USD scene data
- Used by
- iPhone/iPad AR Quick Look, Apple Vision Pro, e-commerce AR
What survives the stl to usdz conversion
Format conversion is honest work: some data has nowhere to go in the target format. Here is exactly what carries over.
Triangle geometry
Every triangle carries over exactly; normals are computed so the model shades correctly in Quick Look.
Real-size AR preview
STL millimeters become USD meters 1:1 numerically - a 50mm miniature reads as 50m in AR unless scaled by 0.001 first. See the FAQ for the quick fix.
Colors & materials
STL has none; the USDZ shows a clean neutral surface - fine for judging shape and size.
UV coordinates
No UVs in STL, so texturing would require unwrapping first.
When should you convert STL to USDZ?
Convert to USDZ to sanity-check prints in AR: stand the model on your desk at intended size before printing, or show a client a physical-scale preview without shipping anything.
The STL remains the printing file - USDZ is preview-only. Slicers don't read USD.
And if what you actually need is a new model rather than a new file format: 3D AI Studio's main tool can generate 3D models from photos with AI - with exports to every format on this page.
STL to USDZ - frequently asked questions
Made with 3D AI Studio
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