DWG to IFC — convert AutoCAD DWG to IFC 4.3 online, free
To convert DWG to IFC, open IFCraft, drop in your .dwg file, map its layers to IFC classes and export. The result is a valid IFC file in the schema you pick — IFC4x3 (IFC 4.3) for infrastructure, or IFC4 / IFC2x3 for older toolchains. The whole conversion runs client-side: the DWG IFC converter is bundled with the app, so you can convert AutoCAD DWG to IFC online without AutoCAD or any other CAD software installed — and nothing is uploaded to a server.
Open IFCraft — free, no sign-up → Runs in your browser.
How to convert DWG to IFC step by step
- Open IFCraft and create a new project. Choose the target schema — IFC4x3 ADD2 for roads, railways and bridges, IFC4 or IFC2x3 for buildings and legacy software.
- Drop in the .dwg file. IFCraft converts it in the browser and reads its meshes, 3D solids, layers, colors and ACAD groups, and detects drawing units.
- Build the element tree. Model the spatial structure (site, road, bridge, building…) and add element slots for your products.
- Map DWG layers to IFC classes. Each rule binds a layer to an element slot — one product per layer, one product per group, or one aggregated product.
- Enrich the model. Property sets, materials, classification (e.g. CCI), documents and georeferencing (S-JTSK / EPSG:5514 via IfcMapConversion).
- Export. One click produces the IFC file, written locally by your browser.
What DWG content is supported?
| DWG content | Support |
|---|---|
| DWG versions | AutoCAD 2007–2018 (AC1021–AC1032) |
| 3D solids (3DSOLID / ACIS) | Yes — converted to meshes in the browser: planar, cylinders, spheres, tori, cones and NURBS surfaces incl. trimmed ones |
| Polyface meshes, MESH entities | Yes — converted to IFC tessellated geometry |
| Layers & colors | Yes — layers drive the mapping rules; color by object or by layer |
| ACAD groups | Yes — a group can become one product or a composite element |
| Solids without stored ACIS data | No — mesh them in AutoCAD first (_MESHSMOOTH), or use Rhino 3DM |
What you get in the IFC
- Valid IFC2x3 (Coordination View 2.0), IFC4 (Reference View 1.2) or IFC4x3 ADD2
- Spatial structure with proper containment and deterministic GUIDs
- Property sets — standard (Pset_*) or your own templates
- Materials, classification references (CCI…), document and library associations
- Georeferencing via IfcMapConversion / IfcProjectedCRS, including S-JTSK (EPSG:5514)
- Optional IDS check of the exported file against your requirement specification
FAQ
Do I need AutoCAD to convert DWG to IFC?
No. The DWG IFC converter is bundled with the app and runs in your browser — you can convert DWG to IFC online without AutoCAD or any other CAD software installed.
Is the DWG uploaded to a server?
No. IFCraft converts and parses the DWG and writes the IFC entirely in your browser; your data never leaves your computer.
Does it read 3D solids?
Yes. 3DSOLID (ACIS) bodies are converted to meshes directly in the browser — planar, cylindrical, spherical and NURBS surfaces including trimmed ones. After loading, the app reports how many solids were recovered.
Which DWG versions work?
AutoCAD 2007 through 2018 (AC1021–AC1032). Newer files can be saved to the 2018 format in AutoCAD.
Can I reuse the mapping for the next drawing?
Yes. Save the project as an .ifcb.json convention and apply it to a new DWG — the tree, rules and libraries are reused.