Skip to content

STEP Viewer

File Viewers

View STEP (.step, .stp) CAD files online in an interactive 3D viewer. No CAD software install, no upload, 100% private.

Drop a file here, or click to choose

Accepts .step, .stp

Rendered with OpenCascade (occt-import-js, WebAssembly). Nothing about this file is ever sent to a server — open your browser's Network tab while using this viewer and you'll see no request carrying your file's contents.

What you can do with this tool

  • Orbit, pan, and zoom camera controls
  • Wireframe toggle
  • Reset-view button
  • Handles multi-solid assemblies in a single file
  • Bounding-box dimensions for the loaded model

Frequently asked questions

What is a STEP file used for?
STEP (ISO 10303, often .step or .stp) is a neutral CAD interchange format used to move precise 3D geometry between different CAD programs — SolidWorks, Fusion 360, Inventor, CATIA, and others.
Do I need CAD software to open a STEP file?
No — this viewer reads the geometry directly in your browser and displays it in 3D, no CAD license needed.
Is this a full CAD viewer with exact geometry?
The underlying engine (OpenCascade, via WebAssembly) reads the file's real geometry, then tessellates it into a mesh for display — the same approach desktop CAD viewers use to draw curved surfaces on screen. Extremely large or complex assemblies may take longer to tessellate or, in rare cases, fail to render; see the on-page message if that happens.
Is my CAD file uploaded anywhere?
No, the entire STEP file is read and processed locally in your browser via WebAssembly.
Does .stp work the same as .step?
Yes, they're the same format with different file extensions — both open in this viewer.

What would you like to do next?

STL Viewer

View STL files online with a rotating, zoomable 3D viewer. Check mesh dimensions before 3D printing — no software install, no upload.

DXF Viewer

View DXF CAD drawings online with layers preserved. No AutoCAD install, no upload, 100% private.

DWG Viewer

View AutoCAD DWG drawings online — convert to DXF for full layer-preserved viewing. No AutoCAD install, no upload.