cadtomesh

Local conversion · WebAssembly · No upload

Convert CAD and 3D files in your browser

This converter reads STEP, IGES, BREP, STL, OBJ, PLY, GLB, glTF, 3MF, FBX, DAE, 3DS, AMF and USDZ, and writes STL, OBJ, PLY, GLB, glTF, 3MF or USDZ. CAD surfaces are tessellated by an OpenCascade WebAssembly kernel; mesh files are parsed with three.js. Everything happens in your browser tab. No upload, no account, no server.

Drop a 3D or CAD file here, or

Read locally · nothing uploaded

3D preview appears after conversion
No model loadedDrag to rotate · scroll to zoom
  • Nothing uploaded
  • No sign-up
  • Works offline after first load

Drag to rotate, scroll or pinch to zoom. Large models are capped at 120,000 faces in the preview only; downloads are never reduced.

01 / What survives

Compatibility

Only triangles survive. This table states what each conversion discards.

FeatureCAD sources (STEP / IGES / BREP)Mesh sources (STL / OBJ / GLB / FBX / ...)
GeometryExact B-rep surfaces are tessellated into triangles. Four detail levels control the deflection.Existing triangles pass through unchanged; no re-tessellation.
Colour and materialDropped in every output format.Dropped in STL, OBJ, PLY and 3MF; kept in GLB and glTF.
UnitsRead as millimetres, then discarded: STL, OBJ and PLY store no unit. 3MF does store one.Not carried into STL, OBJ or PLY. A slicer assumes its own unit.
Structure and historyFlattened to one mesh. Sketches, constraints, assembly tree and PMI are lost.Flattened to one mesh. Object hierarchy, bones, animation and texture paths are lost.

02 / Direct links

More converters

Each pair has a page covering what the source stores, what the target keeps and where the conversion fails.

STEP to STLTessellate exact B-rep surfaces for printing. STEP to OBJWavefront mesh with normals, still no units. STEP to 3MFKeep millimetres in a packaged 3MF file. IGES to STLOlder surface formats often need cleanup. STL to OBJTriangle soup, with no colour added. OBJ to STLDrops materials, UVs and group names. STL to 3MFAdds units and a real container format. 3MF to STLLoses units, colours and multi-part structure. FBX to OBJStatic geometry only, no rig or textures. OBJ to USDZApple AR-ready package, drops OBJ groups. OBJ to GLBSingle-file package with embedded buffers. GLB to OBJUnpacks geometry into a plain OBJ mesh.

03 / Format coverage

Formats and interoperability

Input is detected from the extension. Detail levels appear only for CAD sources, where they set tessellation deflection.

Input   step · stp · iges · igs · brep · 3mf · stl · obj · ply · glb · gltf · fbx · dae · 3ds · amf · usdz

Output   stl · obj · ply · glb · gltf · 3mf · usdz

Output opens in: Cura, PrusaSlicer, Blender, Windows 3D Viewer. STL, OBJ and 3MF suit slicers, GLB and glTF suit web viewers, USDZ suits AR viewers. These are standard formats; no endorsement is implied.

04 / Questions

FAQ

Are my files uploaded anywhere?

No. Your browser reads the file into memory, parses it locally and writes the result as a download. There is no upload endpoint and no account system.

Why is there no quality setting for mesh files?

Detail levels control how finely curved CAD surfaces are tessellated. Mesh files already contain triangles, so there is nothing to tessellate and the control is hidden.

Can I convert more than one file at a time?

One file per run. Switch the output format or detail level to re-run the same file from memory, or drop a new one.