Convert STEP to PLY
Convert a STEP file to PLY in your browser. Free, no upload, no sign-up.
Convert STEP files to PLY directly in your browser. The converter reads the exact STEP geometry with the OpenCascade CAD kernel running in WebAssembly, tessellates it at the quality you choose and writes a PLY file. Nothing is uploaded, there is no file size limit beyond your computer's memory, and the result downloads instantly. PLY preserves per-vertex colors from scans and is the native format of MeshLab and most scanning pipelines.
How to convert STEP to PLY
- 1Drop your STEP file
Drag a .step file onto the box above or click to choose one. The exact geometry is tessellated into triangles in your browser using OpenCascade (the same kernel FreeCAD uses). You can control the mesh density before exporting. Large assemblies may take a while; the first load downloads a 7 MB engine.
- 2Pick the mesh quality
Fine gives smoother curves and a larger file, coarse keeps large assemblies light. The default suits most 3D printing jobs.
- 3Check the preview
The model renders in 3D so you can confirm it loaded correctly. Dimensions, volume and triangle count are shown next to it; open edges are flagged if the mesh is not watertight.
- 4Download the PLY
Adjust the export options if needed and click download. Per-vertex colors are kept when the source has them; textures are not.
What is a STEP file?
STEP (ISO 10303, files ending in .step or .stp) is the neutral CAD exchange format. Unlike mesh formats it stores exact B-rep geometry: analytic surfaces, NURBS, edges and assembly structure with real units. Every CAD system can export STEP, and it is what you receive from suppliers, McMaster-Carr or GrabCAD.
Commonly used by: SolidWorks, Fusion 360, Onshape, FreeCAD, CATIA, Siemens NX, machine shops
The exact geometry is tessellated into triangles in your browser using OpenCascade (the same kernel FreeCAD uses). You can control the mesh density before exporting. Large assemblies may take a while; the first load downloads a 7 MB engine.
What is a PLY file?
PLY was designed at Stanford to store 3D scanner output. It supports per-vertex colors and arbitrary custom properties, in either ASCII or binary encoding, which is why scanning and photogrammetry software prefers it over STL.
Commonly used by: 3D scanners, photogrammetry (Meshroom, RealityCapture), MeshLab, research tools
PLY preserves per-vertex colors from scans and is the native format of MeshLab and most scanning pipelines.
STEP vs PLY
| STEP | PLY | |
|---|---|---|
| Full name | Standard for the Exchange of Product Data (ISO 10303) | Polygon File Format |
| Encoding | Text | Text or binary |
| Geometry type | Exact (B-rep / curves) | Triangle mesh |
| Colors | Yes | Yes |
| Textures | No | No |
| Materials | No | No |
| Stores units | Yes | No |
| Multiple objects | Yes | No |
| Typical use | SolidWorks, Fusion 360, Onshape | 3D scanners, photogrammetry (Meshroom, RealityCapture), MeshLab |