Convert STEP to STL online — free, no signup, no upload
STEP (ISO 10303) stores exact CAD solid geometry; STL is the triangle mesh 3D printers use. This converter tessellates the STEP solid with an OpenCASCADE engine in your browser and writes an .stl — so you can print a CAD part without any CAD software. This converter runs entirely in your browser: your file is read on your device, converted, and downloaded — it is never uploaded to a server.
How to convert STEP to STL
1. Drag your file onto the box above, or click Open STEP file. 2. Preview the model in 3D to confirm it's the right one. 3. Click Convert to STL & download — the new file saves straight to your device.
Frequently asked questions
How do I convert STEP to STL?
Drop your .step or .stp above (or click Open), preview the model, then click Convert to STL & download. It runs in your browser via an OpenCASCADE engine — nothing is uploaded. The first conversion loads the engine (a one-time few-second download).
Can I choose the mesh resolution?
The STEP solid is tessellated at a standard quality suitable for 3D printing. The exact CAD geometry is converted to triangles; finer control is on the roadmap.
Is my STEP file uploaded?
No — the tessellation and conversion happen entirely on your device; your CAD model never leaves your computer.