Compare
DWG vs STEP
DWG is a native CAD drawing format common in AutoCAD workflows; STEP is a neutral exchange format for product and 3D CAD data.
Which format should you choose?
Keep DWG for compatible native drawing work; use STEP to exchange supported 3D product geometry between CAD systems.
Good fit for DWG
AutoCAD design workflow
- Continuing editable drafting with layers and dimensions in a compatible CAD system
Good fit for STEP
Cross-CAD 3D exchange
- Sending solid parts and assemblies to a partner using another CAD system
Basic information
| Field | DWG | STEP |
|---|---|---|
| Extension | .dwg | .step, .stp |
| MIME type | application/acad, image/vnd.dwg | model/step |
| Common uses | AutoCAD design workflow | Cross-CAD 3D exchange |
| How to open | Open in a compatible CAD viewer and inspect version, references, layers, and scale. | Open in a STEP-capable CAD viewer and inspect units, solids, surfaces, assemblies, and attributes. |
| Export or convert | When exporting DXF, check text, dimensions, layers, external references, and recipient version. | After importing into native CAD, verify holes, surfaces, assembly structure, and units; feature history may not survive. |
Choose by use case
Continuing editable drafting with layers and dimensions in a compatible CAD system
AutoCAD design workflow
DWGSending solid parts and assemblies to a partner using another CAD system
Cross-CAD 3D exchange
STEPKey point 1
DWG is used for CAD drawings and native editing workflows.
More on the differencesKey point 2
STEP transfers supported product geometry and related data between systems.
More on the differencesMore on the differences
They serve different roles: STEP is not a substitute for a 2D drawing. After export, inspect geometry, units, annotations, references, and required native features.
- DWG compatibility can depend on application and file version.
- STEP (ISO 10303) is a product-data exchange format; native edit history may not transfer.
Frequently asked questions
Does STEP preserve everything in a DWG drawing?
No. STEP targets product and 3D CAD data exchange, not every DWG drawing detail. Choose based on the required data and verify the export.