Format Guide
The native format of AutoCAD — the most widely used CAD software in the world
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| Extension | .dwg |
|---|---|
| Full name | AutoCAD Drawing |
| Geometry type | 2D/3D mixed (ACIS solids, meshes, wireframe) |
| Open standard | No (proprietary, Autodesk) |
| Supports color | Yes |
| Supports assemblies | Yes (xrefs, blocks) |
| Supports materials | Yes |
DWG (Drawing) is the proprietary binary file format used by AutoCAD, the dominant software for computer-aided design. Created by Autodesk, DWG files store 2D and 3D design data including geometry, metadata, and associated resources. With over 12 million users worldwide, DWG is the de facto standard in architecture, engineering, and construction (AEC). However, AutoCAD subscriptions cost $1,975/year, making simple file conversion prohibitively expensive for many professionals.
Floor plans, building sections, structural details, and site plans. DWG is the standard deliverable format for architectural firms and contractors worldwide.
Part drawings, assemblies, manufacturing specifications, and technical documentation. DWG files are used throughout the product development lifecycle.
Road layouts, utility drawings, topographic surveys, and land subdivision plans. Civil engineers rely on DWG for municipal and infrastructure projects.
AutoCAD ($1,975/year), BricsCAD ($756/perpetual), DraftSight ($99/year), FreeCAD (free), LibreCAD (free, 2D only). Most alternatives can open DWG but may not support all features.
3D CAD Converter reads DWG files and batch converts them to STL, OBJ, glTF, and 15+ other 3D formats — without requiring AutoCAD. Drag and drop entire folders of DWG files for instant batch conversion with progress tracking.
| Tool | Price | Model |
|---|---|---|
| CAD Exchanger | Subscription (annual renewal) | |
| Spin 3D | Subscription (annual renewal) | |
| 3D CAD Converter | $179 | ✔ Pay once, own forever |
Prefer the command line? The bundled CLI converts a single drawing or a full folder in one command:
DWG is AutoCAD's proprietary binary format, while DXF is the open text-based exchange format Autodesk publishes so other tools can read AutoCAD data. DWG is more compact and preserves every AutoCAD feature; DXF is more portable and is the format most third-party CAD, CNC and laser tools accept. Both can hold 2D drawings and 3D geometry, and 3D CAD Converter reads either one and converts the 3D geometry to neutral mesh and solid formats.
Compare: DXF · all CAD formats
DWG has changed format with almost every AutoCAD release (R12, 2000, 2004, 2007, 2010, 2013, 2018). Older tools often refuse newer DWG files. 3D CAD Converter reads modern DWG revisions directly, so you do not have to down-save in AutoCAD first.
Many DWG files are pure 2D drawings (lines, arcs, text) with no solid model to mesh. Conversion to a 3D format only produces useful output when the DWG actually contains 3D solids, surfaces or meshes. Check the drawing in a viewer if the result looks flat or empty.
Because DWG is closed, features such as custom object enablers, proxy entities and xref-linked blocks may not be fully represented by any non-Autodesk reader. Bind external references and explode proxy objects in AutoCAD before converting for the most complete geometry.
A .dwg file is AutoCAD's native drawing format. It stores 2D and 3D design data — geometry, layers, blocks, dimensions and metadata — in a proprietary binary format created by Autodesk. It is the de facto standard in architecture, engineering and construction.
You can open DWG files in free tools such as DraftSight, LibreCAD or FreeCAD, or use a free online DWG viewer just to look at them. To turn DWG geometry into a 3D mesh or solid file, 3D CAD Converter reads DWG directly and converts it without any AutoCAD licence.
Not with 3D CAD Converter. Both DWG and DXF are read-only inputs here — neither can be selected as an output format. 3D CAD Converter is for converting DWG into 3D formats such as STEP, STL, OBJ and glTF. To go from DWG to DXF, use AutoCAD, DraftSight or another 2D CAD editor.
Yes. 3D CAD Converter has a free trial you can download and use to convert DWG files on Windows before buying. It is a one-time purchase with no subscription, unlike most CAD interop tools.