STEP / IGES viewer

Parse STEP, IGES, BREP via OpenCascade WASM.

Runs entirely in your browser. Files never leave your device.

Choose a 3D file

.step / .stp / .iges / .igs / .brep

How it works

1
Drop a STEP / IGES file
Add a .step, .stp, .iges, .igs or .brep file — everything stays on your device.
2
Wait for tessellation
OpenCascade WASM converts the exact B-Rep geometry into a rendering mesh.
3
Export or snapshot
Save the tessellated mesh as STL, OBJ, PLY or GLB, or capture a PNG preview.

How does STEP parsing work in the browser?

OpenCascade — the same CAD kernel behind FreeCAD — is compiled to WebAssembly and tessellates the B-Rep into triangles on your device.

Does it support IGES and BREP too?

Yes. .step, .stp, .iges, .igs, .brep and .brp files are all handled by the same OpenCascade WASM build.

Will assembly colours be preserved?

Per-face and per-shape colours from STEP are read when available and applied to the tessellated mesh.

Open .stl models — orbit, wireframe, snapshot, convert.

Open Wavefront .obj meshes with orbit and wireframe.

Preview .glb and .gltf 3D assets in your browser.

Convert between STL, STEP, IGES, OBJ, PLY, GLB, FBX, 3MF, DAE.

Reduce triangle count with meshoptimizer — lighter STL / GLB.

Snapshot a PNG preview from any 3D model file.