← The Bench · Sheet C-11
CAD viewer
Upload a solid model or a drawing — STEP, IGES, BREP, STL, OBJ, PLY, 3MF or DXF. Turn it over, cut a section through it, measure it, and save it out as something else.
Your file is read in this tab and never sent anywhere. There is no upload endpoint on this site to send it to, which is the only version of that promise worth making about a part you are not allowed to share.
.step.stp.iges.igs.brep
.stl.obj.ply.3mf.dxf
Drop a file here
Or upload one. It is read on this device — nothing is sent anywhere.
.step.stp.iges.brep
.stl.obj.ply.3mf.dxf
Drag to orbit, shift-drag to pan, scroll to zoom. With Measure on, click two points for the distance between them.
Meshes
STL binary and ASCII, OBJ, PLY ASCII and binary, and 3MF. Bounding box, triangle count, surface area, and volume where the mesh is actually closed — it says so when it is not, because a volume from an open surface is a number with nothing behind it.
Drawings
DXF, ASCII. Lines, arcs, circles, ellipses, polylines with bulges, splines, text, solids, and blocks with their inserts resolved and transformed. Layers can be switched off, and switching one off removes it from what you export as well as from what you see.
Solid models
STEP, IGES and BREP describe trimmed surfaces and topology rather than triangles, so they are handed to a real geometry kernel — Open CASCADE, compiled to WebAssembly and served from this site. It evaluates the surfaces and meshes them, and from there they measure and section like anything else.
The kernel is 7.6 MB and is fetched only when you open one of those three formats — open an STL and not a byte of it is downloaded. It is vendored into this site rather than pulled from a CDN, so the bytes that run are the bytes in the repository. Open CASCADE is LGPL-2.1 and the licence travels with it.
DWG is the one thing still refused. It is proprietary, undocumented and changes between releases, and no reader for it can be trusted not to fail on the version you happen to have. Save As → DXF: it is Autodesk's own published interchange format and opens here with layers and blocks intact. PDF drawings already open in your browser.