Is there a free IFC 4.3 converter?

Yes — IFCraft is free, runs in the browser without sign-up and converts DWG, DXF, Rhino 3DM, LandXML, glTF and OBJ into valid IFC2x3, IFC4 or IFC4x3 (IFC 4.3) files. Your data never leaves your browser.

What is IFC 4.3 and why does it matter?

IFC 4.3 (IFC4X3) is the first IFC schema built for infrastructure: it adds alignments, linear placement and classes like IfcBridge, IfcRoad and IfcRailway. It is an ISO standard (ISO 16739-1:2024) required in a growing number of road and rail projects.

Free IFC 4.3 converter — online, no sign-up

Q: Is the output really valid IFC?

IFCraft writes schema-valid STEP files with deterministic GUIDs, proper MVD headers (Coordination View 2.0, Reference View 1.2, Alignment-based View) and georeferencing entities, and can check the export against an IDS requirement specification.

IFCraft is a free IFC 4.3 converter — a CAD to IFC converter that runs entirely in your browser. It takes DWG, DXF, Rhino 3DM, LandXML, glTF or OBJ as input and produces a valid IFC file in IFC4x3 ADD2 (IFC 4.3), IFC4 or IFC2x3 — including alignments, georeferencing, property sets and classification. No installation, no account, and no upload: your models are processed locally.

Open IFCraft — free, no sign-up → Runs in your browser.

Why IFC 4.3?

IFC 4.3 (IFC4X3) is the first IFC schema designed for infrastructure: it adds alignments (IfcAlignment), linear placement along an axis, and spatial classes such as IfcBridge, IfcRoad, IfcRailway and IfcMarineFacility. It is published as ISO 16739-1:2024 and is increasingly required on road and rail projects — in the Czech Republic through the DS SFDI data standard. Most desktop tools still need paid licenses or plug-ins to write it; IFCraft does it for free, in the browser.

What the converter does

Step	What happens
1 · Read	DWG, DXF, Rhino 3DM, LandXML, glTF or OBJ is parsed locally (layers, groups, colors, units, alignments)
2 · Structure	You build the element tree (site, bridge, road…) and map source layers to IFC classes
3 · Enrich	Property sets, materials, CCI or other classifications, documents, georeferencing (e.g. S-JTSK / EPSG:5514)
4 · Export	A schema-valid STEP file with deterministic GUIDs and correct MVD headers is written by your browser
5 · Check	Optionally validate the result against an IDS requirement specification before you hand it over

Free and private. IFCraft is free and 100% client-side — no upload, no telemetry on your model data, no locked features.

Supported conversions

DWG to IFC 4.3 — AutoCAD drawings (2007–2018) incl. 3D solids
DXF to IFC 4.3 — AutoCAD / Civil 3D drawings with meshes and 3D solids
Rhino 3DM to IFC 4.3 — meshes, Breps and layer hierarchy from Rhino / Grasshopper
LandXML to IFC 4.3 — road/rail alignments to IfcAlignment
glTF (.glb) and OBJ meshes from any 3D tool

FAQ

Is it really free? What's the catch?

There is none: IFCraft is free to use and has no premium tier. It is built and maintained by Michal Marvan as part of the checkthebim toolset.

Is the output really valid IFC?

Yes — schema-valid STEP with deterministic GUIDs, correct MVD headers (Coordination View 2.0 / Reference View 1.2 / Alignment-based View) and proper georeferencing entities. You can additionally check the export against an IDS specification directly in the app.

Can it convert IFC to other formats?

No — IFCraft converts into IFC. For viewing and validating existing IFC files, see its sister tool BIM Checker.