WorkbenchA useful little toolbox.

STEP to STL

Tessellate a STEP model and download a binary STL in millimetres.

Processed on your device. No file upload.
Choose a file to get started

Drop it here, or use the file picker.

How to use this tool

  1. Choose your file or try the example.
  2. Run the tool and check the result.
  3. Save the result where a download is available.

Supported features & limits

Uses local OpenCascade WASM, about 8 MB on first use. STEP up to 10 MB; 90-second worker limit; at most one million output triangles. Output millimetres. Linear deflection is an absolute meshing tolerance, 0.01–5 mm; angular deflection 0.5 radians. Colors, names, assembly hierarchy and CAD features are not stored in STL. Meshing is approximate and may require more memory for complex models. No external STEP references are fetched.

Reference

What happens to my files?

Your browser reads the file locally. File contents are not sent to our server. Closing or resetting this page clears the working result. Downloaded copies remain on your device.

Maintained by Roman Zmazhenko. Updated 1 November 2026.