STEP & IGES Viewer
View STEP and IGES CAD files in your browser. No upload, no account, and nothing leaves your device.
Drop a .step, .stp, .iges or .igs file below. CAD parts and assemblies exported from SolidWorks, Fusion 360, Onshape, Inventor, CATIA, FreeCAD and the rest render in your browser, and nothing is uploaded: the file is read and tessellated on your own device.
Drag to orbit, scroll to zoom. Assemblies keep their per-part colours, so the pieces stay distinct, and Wireframe shows the tessellated edges.
Reads: STEP (.step, .stp; AP203, AP214 and AP242) and IGES (.iges, .igs). Both are B-rep formats, carrying exact trimmed-surface geometry and topology rather than a mesh, so they are tessellated into triangles for display by the OpenCASCADE CAD kernel, compiled to WebAssembly and run entirely in your browser.
First open is slower
The CAD kernel is about 7 MB and loads once, the first time you open a STEP or IGES file in a session. After that it is instant, and it is a separate module that nothing else on the site pulls in.
Working with mesh files?
For STL, OBJ, PLY, 3MF or GLB, use the 3D File Viewer instead: same idea, and no CAD kernel to load.