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.stepSTEP→.usdzUSDZtessellated

Convert STEP to USDZ

Convert STEP to USDZ in your browser. The conversion runs on this page and the file never leaves your computer.

Drop your .step file

up to 250 MB · .step .stp

Free, and it opens in this tab. Nothing is uploaded, and there's no account to make.

Runs locally · nothing uploaded · the CAD kernel loads once you choose a file

Before you convert: what this keeps and what it destroys

Preserved

  • The shape, to within the tessellation tolerance
  • Overall dimensions and proportions
  • Watertightness, where the input is watertight
  • The unit, recorded in the file
  • Colour
  • Separate parts and their positions

Destroyed

  • Exact curves and surfaces, replaced by triangles
  • The feature tree and any parametric history

↺ the reverse: USDZ → STEP · about .step · about .usdz · just view it instead

Why people convert STEP to USDZ

This is how you put a machined part on somebody's desk before it has been made. Tapping a USDZ on an iPhone or iPad opens AR Quick Look, which places the model in the room at full size with nothing to install.

For a mechanical part that is more useful than it sounds. Proportion mistakes that survive every on-screen review tend to become obvious the moment the thing is sitting next to a coffee cup at 1:1.

STEP declares its unit, so the conversion into USD's metres is exact and the model appears at its true size. Exact surfaces are tessellated on the way, and the assembly structure survives as a scene hierarchy. What you are sending is something to look at, not something to manufacture from.

What you get

You get a binary USDZ file containing triangles. The reader tessellates supported surfaces or uses saved render meshes where required by the source format. Inspect curved faces at the intended output size. The triangle count depends on the model and the reader's meshing settings.

Carried across: the unit, recorded in the file, supported base or vertex colour, the supported part structure.

The conversion runs in your browser. Your file stays on your computer and is not uploaded.

What to check afterwards

  • STEP 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. USDZ is read in metres and STEP in millimetres, so every coordinate is rescaled. The result is the same physical size, but the numbers in the file are different numbers.
  • Curves become facets. STEP stores exact surfaces, so a hole is a cylinder with a radius. USDZ stores triangles, so that cylinder becomes a many-sided prism. Look at curved faces in the result at the size you intend to make the part.

If you need something this conversion cannot give you

If you need editable CAD geometry, don't convert at all. Open the STEP file directly in FreeCAD, Fusion, Onshape or SolidWorks. Every mesh format destroys the exact surfaces, and no later conversion brings them back.

Going the other way

Convert USDZ back to STEP exists, but it is not the inverse of this page. Going this way tessellates exact surfaces into triangles. Going back rebuilds a faceted solid out of those triangles. You do not get your original surfaces back, and the round trip is lossy in a way that compounds.

How we know this conversion works

This pair was checked against 44 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.