Convert STEP to DXF
Convert a STEP file to DXF in your browser. Free, no upload, no sign-up.
Convert STEP files to DXF 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 DXF file. Nothing is uploaded, there is no file size limit beyond your computer's memory, and the result downloads instantly. DXF is what 2D CAD software, laser cutters and CNC routers read, and AutoCAD imports a mesh from it with no plugin.
How to convert STEP to DXF
- 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 DXF
Adjust the export options if needed and click download. The mesh is written as 3DFACE triangles in millimeters. Colors, textures and materials are dropped, and the result is a faceted mesh rather than editable CAD curves.
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 DXF file?
DXF is the open interchange format Autodesk published for AutoCAD in 1982. Most DXF files are 2D drawings: lines, arcs, polylines and text on layers. Some also carry 3D geometry as 3DFACE entities. It is what 2D CAD, laser cutters and CNC routers exchange.
Commonly used by: AutoCAD, LibreCAD, QCAD, Laser cutters, CNC routers, Fusion 360 sketches
DXF is what 2D CAD software, laser cutters and CNC routers read, and AutoCAD imports a mesh from it with no plugin.
STEP vs DXF
| STEP | DXF | |
|---|---|---|
| Full name | Standard for the Exchange of Product Data (ISO 10303) | Drawing Exchange Format |
| Encoding | Text | Text |
| Geometry type | Exact (B-rep / curves) | Exact (B-rep / curves) |
| Colors | Yes | No |
| Textures | No | No |
| Materials | No | No |
| Stores units | Yes | Yes |
| Multiple objects | Yes | Yes |
| Typical use | SolidWorks, Fusion 360, Onshape | AutoCAD, LibreCAD, QCAD |