Nothing is uploaded; pick a face and export DXF in your browser with the step2dxf engine. Face and Projection both ship; Projection is gated so the tab cannot look hung.
dxf-DR
Drop a STEP file
Tap Choose STEP file, or drop one here
.step / .stp only. Converted locally in your browser.
Engine: step2dxf (closed source) + Open CASCADE Technology 7.9.3 (LGPL 2.1 with the Open CASCADE exception). Licences & system requirements