Convert STP to DXF
Upload a .stp (STEP) file and get a 2D DXF containing one automatically chosen orthographic view of the model's visible edges, written in millimeters. There is one view per file, no dimensions, and every entity lands on a single layer named none, so plan to add layers and dimensions in your CAD or CAM program.
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What an STP to DXF conversion actually gives you
A .stp file is a STEP model (ISO 10303), and what it stores is exact solid and surface geometry: faces, trimmed curves, topology. That is ideal for machining and simulation, but it says nothing about drawing sheets. Laser cutters, plasma tables, CNC routers, sign-cutting software and older drafting packages expect a flat DXF, and most of them cannot open a .stp at all, which is why this conversion exists.
On our servers the file is read with the OpenCASCADE kernel inside FreeCAD 1.1 and converted to millimeters, then projected to 2D with TechDraw. Only visible edges are kept, so holes, slots and fillet boundaries that face the camera appear while everything behind the material is discarded. The view direction is picked automatically: the normal of the planar faces with the largest combined area, with ties going to Z, then Y, then X. If planar faces make up less than 20 percent of the surface area, the thinnest bounding-box axis is used instead. For a plate or a laser-cut bracket that means the flat face looks straight at you.
The geometry that survives is real curve data, not a traced approximation: lines, arcs, circles and splines in an AutoCAD 2000 (AC1015) DXF with the drawing units set to millimeters. Degree-one and straight splines are simplified to LINE entities and duplicate coincident edges are dropped, so the file stays clean for CAM. What is lost is everything that is not that one outline: no depth, no second view, no section, no hidden-line layer, no dimensions, annotations or title block, and no sheet-metal unfolding. Every entity lands on one layer named none, and STEP colors, part names and assembly structure are never read, so a multi-part assembly projects all of its parts into the same view, overlapping. If you need the full three-dimensional shape instead of a drawing, convert the same .stp to a mesh format such as STL, OBJ or 3MF, or convert it to IGES if you need exact surfaces rather than triangles.
How to convert an STP file to DXF
- Export or locate a single .stp or .step file that contains the geometry itself. An assembly that only references external part files has nothing to project and will fail, so export it as one file with geometry included.
- If orientation matters, rotate the part in your CAD program before exporting so the face you want to see is the largest planar face. The projection direction cannot be chosen here.
- Drop the file onto the upload area. The target is fixed to DXF. Guests can send files up to 50 MB and a free account raises that to 100 MB, with up to 10 files per request.
- Wait for the job to finish. STP files on this page are usually small, and most of them complete within a few seconds of the upload finishing.
- Download the DXF from the link on the page. The link stays valid for about four hours.
- Open it in your CAD or CAM software, confirm the overall size reads in millimeters, then add layers, lead-ins or dimensions there before cutting.
What the converter does
- One orthographic view of the model's visible edges, with the direction chosen from the part's largest planar faces or its thinnest axis
- True curve entities: circles stay CIRCLE, arcs stay ARC, and straight splines are reduced to LINE instead of being chopped into segments
- AutoCAD 2000 (AC1015) DXF output with drawing units written as millimeters, which most CAM and drafting software reads without a dialog
- Accepts .stp and .step, and repairs common export problems: gzip-compressed files, UTF-16 text, a byte-order mark, or a missing END-ISO-10303-21 terminator
- A STEP that only contains curves or wireframe is written out as those curves, laid flat when they are planar, instead of being refused
- Free to use with no account, within the guest file-size and batch limits
Video Tutorial
Detailed guide on how to convert STP files to DXF quickly, for free, and without losing original quality. Perfect if you need to process file formats, reduce size, or upload files to systems that only
STP to DXF questions
Can I choose the view, or get a section and multiple views?
No. Each conversion produces exactly one automatically chosen view, with no setting for view direction, sections, scale or hidden lines. If you need a front/top/side sheet or a cut section, rotate the part before exporting the .stp, or build a proper drawing in your CAD program.
Is the DXF 2D or 3D?
It is 2D. The output is one flat projection of the visible edges, not a 3D wireframe or solid. For the three-dimensional shape, convert the .stp to STL, OBJ, 3MF or PLY instead; those are triangle meshes generated at a fixed 0.1 mm chord tolerance, so curved surfaces become faceted.
Can you convert STP to DWG?
Not on MiConvert, DXF is the only 2D output here. Nearly every CAD program will open the DXF and save it as DWG, and we do handle the other direction, DWG to DXF, on its own page.
Does it unfold sheet metal into a flat pattern?
No. The converter projects the part exactly as it is modeled, so a bent part gives you the outline of the bent shape, not the developed blank. Unfold the part in your CAD program, export the flat pattern as .stp, and convert that file.
Why do I get "No valid 3D geometry found in this file"?
That generic message usually means an assembly .stp that only points at other part files, an empty export, or a tessellated AP242 STEP that stores triangles instead of surfaces and cannot be projected into a drawing view. Re-export with geometry included as standard B-rep surfaces; if the file really is mesh-only, convert it to STL or OBJ instead. Engine reasons are collapsed into two generic texts, so the page will not say which case applied.
Are layers, colors, part names or dimensions carried over?
No. Everything is written to a single layer named none, and STEP colors, product names and the assembly tree are not read by the converter, so nothing of that kind can appear in the DXF. Annotations and dimensions are not produced either; the output is pure geometry.
Will the cut size be correct for my laser or router?
The geometry is converted to millimeters on import and the DXF records millimeters as its drawing unit, so a 60 mm plate measures 60 units. Still check the overall size after importing, because some CAM programs ignore the unit header.
What happens to my file after the conversion?
Conversions run on our servers, not in your browser. The .stp you upload is deleted as soon as the job's final attempt ends, and the finished DXF stays available through its private download link for about four hours before it is deleted automatically. File names, sizes and outcomes are logged, and signed-in users see the conversion in their history.