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3DAI
Free · runs in your browser · no signup

STEP to GLB Converter

STEP is how CAD tools exchange exact solids, but a website, an AR preview or a product configurator needs a mesh such as GLB. This page turns the STEP surfaces into triangles in your browser with the open-source OpenCascade kernel (occt-import-js), keeps every part of an assembly as its own mesh with the colour set in the CAD file, and writes a GLB in metres, Y-up, as glTF expects. Your design never leaves your computer. FreeCAD, SolidWorks, Fusion and other CAD names are used only to describe compatible files; we are not affiliated with their makers.

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How to use it

  1. 1

    Drop the .step or .stp

    Exports from any CAD program work. The CAD kernel (about 3 MB) downloads the first time, then the file is meshed on your device.

  2. 2

    Pick the detail

    Draft, standard, fine or very fine sets how closely the triangles follow curved faces. Finer looks smoother but makes a larger file.

  3. 3

    Check the unit

    Metres is chosen because glTF is metres, so the part shows at real size in AR. Pick millimetres to keep the CAD numbers as they are.

  4. 4

    Download the GLB

    One file with every part and its colour, ready for a glTF viewer, a model-viewer tag, Blender or a game engine.

What to know before you convert

  • A GLB is a mesh: exact curves, features, sketches and the design history are not part of it. Keep the STEP for editing.
  • Colours are kept per part. Colours set on single faces are not; such parts use one colour.
  • Assemblies are flattened: every part becomes a mesh in place, without the assembly tree or constraints.
  • Very large assemblies need a lot of browser memory. Use draft detail if the page runs out of memory.

Don't have a model?

Create one with AI from a photo, a sentence or a sketch. The generators use credits; this converter is free and stays in your browser.

Image to 3D →Turn one photo into a textured 3D model.Text to 3D →Describe an object and get a GLB.Sketch to STL →Draw it, get a printable model.

Frequently Asked Questions

Drop the .step or .stp file on the box above, keep metres and click Download. The GLB opens in any glTF viewer.
No. The STEP file is meshed inside your browser by a WebAssembly build of OpenCascade. Nothing about the design is sent to a server, which matters for client and unreleased work.
Yes. Each part keeps the colour its CAD program stored in the STEP file. Parts with no colour come out light grey.
GLB stores triangles, not exact curves. Choose fine detail before downloading for smoother round faces, at the cost of a bigger file.
Yes. GLB is the format web model viewers and Android AR load. Because it is in metres, it appears at real size. For iPhone AR, turn the GLB into USDZ with our GLB to USDZ page.
None. .stp and .step are two extensions for the same ISO 10303 format, and both are accepted.
No. The page reads the file and converts it inside your browser with the open-source three.js library. Nothing is sent to our servers, there is no account, and no credits are used. Closing the tab discards everything.