Convert USDZ to STEP
Convert USDZ to STEP. This is the one conversion on this site that runs on a server, because rebuilding a solid from triangles needs more than a browser can do. Your file is deleted within an hour.
Result
Before you convert: what this keeps and what it destroys
Preserved
- The shape, as planar faces built from the triangles
- Overall dimensions and proportions
- Watertightness, where the input is watertight
- The unit, recorded in the file
- Colour
- Separate parts and their positions
Destroyed
- Cones, spheres, tori and NURBS, rebuilt as planar facets
- Animation, rigs, cameras and lights, if the file has them
↺ the reverse: STEP → USDZ · about .usdz · about .step · just view it instead
Why people convert USDZ to STEP
Somebody sent you an AR file and now wants the part made. That is the case this page exists for, and it is worth being blunt about what is possible.
USDZ is a presentation format. It carries triangles for looking at, with no exact surfaces and no manufacturing intent anywhere in it. This conversion merges coplanar triangles into planar faces and builds a B-rep solid from them, which a CAD package will open and which you can model around. It will not give you cylinders, NURBS surfaces or a feature tree, because none of those are in the file.
The scale at least is honest: metersPerUnit is read from the stage and converted into the millimetres STEP is written in. The stage must be text USDA.
What you get
You get a plain-text STEP file you can open in an editor containing a boundary representation: planar faces, shared edges and, where the input was closed, a closed shell that CAD software will treat as a solid. Triangles that lay in the same plane are merged into single faces, so a flat side that arrived as two hundred triangles leaves as one face.
Carried across: the unit, recorded in the file, supported base or vertex colour, the supported part structure.
This conversion runs on a server. The upload is deleted within an hour, and nothing about you is recorded alongside it: no IP address, no filename, no account.
What to check afterwards
- USDZ declares its unit in the file. Check the output dimensions in the receiving application, especially when its import settings can override the unit.
- The numbers change. STEP is read in millimetres and USDZ in metres, so every coordinate is rescaled. The result is the same physical size, but the numbers in the file are different numbers.
- This is a reconstruction, not a recovery. Coplanar triangles are merged into planar faces and the result is a real solid, but cones, spheres, tori and NURBS surfaces are not recovered and there is no feature tree. Use it as reference geometry.
If you need something this conversion cannot give you
If you need a parametric model, use the original CAD file or remodel the part using this output as reference. Surface fitting can create new geometry, but a mesh does not contain the original sketches or feature history.
Going the other way
Convert STEP back to USDZ is the reverse page. It is not the inverse of this one: reconstructing a solid from triangles produces faceted geometry, and tessellating it again would not return you to where you started.
How we know this conversion works
This pair was checked against 4 files from the test corpus on 2026-09-04. Each run parses its own output back in and compares the bounding box, the triangle count and, for closed solids, the volume against the input.
A pair that fails those checks doesn't get a page. That's why this site lists 120 conversions and not the several hundred a format-times-format grid would suggest.