STEP to GLB converter

Drop a STEP file, check the preview, download GLB. The conversion runs in your browser, so your model never leaves your device.

Convert the attached STEP file to GLB

Files are processed entirely in your browser. Nothing is uploaded to a server.

Any 3D edit is just a prompt away.

How the conversion works

STEP (.step / .stp) is a CAD exchange format that describes exact surfaces such as cylinders, fillets, and splines instead of triangles. FreeCAD, Fusion, and SolidWorks all export it.

The converter writes GLB, so the result loads directly in web viewers, e-commerce embeds, and most game engines.

The conversion runs Open CASCADE, the same geometry kernel FreeCAD uses, compiled to WebAssembly. Your CAD surfaces are tessellated into a watertight mesh right in the browser tab.

Frequently asked questions

Does my file get uploaded?

No. Parsing and export run in your browser with WebAssembly and three.js. The file stays on your device, and it works offline once the page has loaded.

What survives the STEP to GLB conversion?

Exact CAD surfaces become triangles at a fixed resolution. That step is one-way: the mesh can't be turned back into parametric CAD. Dimensions are preserved, so the part prints at the right size.

Does it handle assemblies?

Yes. All bodies in the STEP file are merged into one mesh. If you need the parts separated, export them individually from your CAD tool, or cut the result with the split tool afterwards.

Is there a file size limit?

Models up to 8 million triangles work. STL files can be any size below that; other formats stop at 300 MB. Heavier meshes take longer rather than failing outright; if a file is unwieldy, reduce its triangle count first with the reduce tool.

More STEP conversions

STEP → STL STEP → OBJ All converters

More free 3D file tools

View a model Repair a model Reduce file size Convert 3D files Measure a model Scale a model Split a model Mirror a model Print orientation Print weight & cost

Describe a part. Get a printable model.

GrandpaCAD turns a text prompt into a ready-to-print 3D model. Functional parts, organic shapes, multi-color prints. No CAD skills needed.

"Model a snap-fit clip that holds a phone charging cable on a desk edge up to 25 mm thick."

3 free generations, no card required

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STEP to GLB converter

Drop a STEP file, check the preview, download GLB. The conversion runs in your browser, so your model never leaves your device.

Convert the attached STEP file to GLB

Files are processed entirely in your browser. Nothing is uploaded to a server.

Any 3D edit is just a prompt away.

How the conversion works

STEP (.step / .stp) is a CAD exchange format that describes exact surfaces such as cylinders, fillets, and splines instead of triangles. FreeCAD, Fusion, and SolidWorks all export it.

The converter writes GLB, so the result loads directly in web viewers, e-commerce embeds, and most game engines.

The conversion runs Open CASCADE, the same geometry kernel FreeCAD uses, compiled to WebAssembly. Your CAD surfaces are tessellated into a watertight mesh right in the browser tab.

Frequently asked questions

Does my file get uploaded?

No. Parsing and export run in your browser with WebAssembly and three.js. The file stays on your device, and it works offline once the page has loaded.

What survives the STEP to GLB conversion?

Exact CAD surfaces become triangles at a fixed resolution. That step is one-way: the mesh can't be turned back into parametric CAD. Dimensions are preserved, so the part prints at the right size.

Does it handle assemblies?

Yes. All bodies in the STEP file are merged into one mesh. If you need the parts separated, export them individually from your CAD tool, or cut the result with the split tool afterwards.

Is there a file size limit?

More STEP conversions

STEP → STL STEP → OBJ All converters

More free 3D file tools

View a model Repair a model Reduce file size Convert 3D files Measure a model Scale a model Split a model Mirror a model Print orientation Print weight & cost

Describe a part. Get a printable model.

GrandpaCAD turns a text prompt into a ready-to-print 3D model. Functional parts, organic shapes, multi-color prints. No CAD skills needed.

"Model a snap-fit clip that holds a phone charging cable on a desk edge up to 25 mm thick."

3 free generations, no card required