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CAD & 3D • MIME: image/vnd.dwg

.DWG File Extension

Industry standard binary CAD file format storing 2D and 3D architectural and engineering designs.

Category CAD & 3D
MIME Type image/vnd.dwg
Magic Bytes 41 43 31 30 (AC10...)
Developer Autodesk Inc.
Typical Size 2 MB – 120 MB
Security Risk Medium Risk

Format Architecture & Technical Specifications

DWG (Drawing) is a proprietary binary file format created by Autodesk in 1982. It is the gold standard format for computer-aided design (CAD) storing vector geometry, 3D meshes, BIM data, layers, and geospatial coordinates.

How to Open .DWG Files

1 Download DWG TrueView

Download official free DWG TrueView standalone viewer from Autodesk.

2 View Online in Browser

Use Autodesk Web Viewer or AnyFileX DWG Inspector tool.

3 Open in AutoCAD

Use File > Open command inside AutoCAD or DraftSight.

Compatible Software Programs

Autodesk AutoCAD 2024

windows, mac • Commercial

DWG TrueView (Free Viewer)

windows • Free

eDrawings Viewer

windows, mac • Free

LibreCAD Open Source

windows, mac, linux • Free

Autocad Web App

windows, mac, linux • Free

Security Considerations & Verification

DWG drawings can embed AutoLISP macros and VBA scripts. Disable automatic macro execution when opening untrusted CAD drawings.

  • Use AutoCAD RECOVER or AUDIT command to reconstruct damaged drawing tables.
  • Check DWG header version string (AC1032 = AutoCAD 2018+, AC1027 = AutoCAD 2013).
  • If drawing freezes AutoCAD, purge external references (XREFs) using DWG Convert.

Frequently Asked Questions

What is a .DWG file?

A .DWG file is a AutoCAD Drawing Database associated with CAD & 3D. Industry standard binary CAD file format storing 2D and 3D architectural and engineering designs.

How do I open a .DWG file on Windows or Mac?

You can open .DWG files using Autodesk AutoCAD 2024, DWG TrueView (Free Viewer), eDrawings Viewer, LibreCAD Open Source, Autocad Web App. If you do not have native software installed, you can use AnyFileX's free File Identifier or convert .DWG to a standard format in your browser.

Is a .DWG file safe to open?

This format carries a safety rating of Medium Risk. DWG drawings can embed AutoLISP macros and VBA scripts. Disable automatic macro execution when opening untrusted CAD drawings.

Can I convert a .DWG file to other formats?

Yes! .DWG can be converted to formats such as .PDF, .DXF directly in your web browser.

What should I do if a .DWG file is corrupted or won't open?

If your .DWG file displays an invalid header or signature error, check its magic bytes hex header (41 43 31 30 (AC10...)) using AnyFileX's Magic Byte Detector or follow our step-by-step file repair guide.

How can I view DWG files without buying AutoCAD?

Autodesk provides free DWG TrueView for Windows and Autodesk Viewer for web browsers.

What is the difference between DWG and DXF?

DWG is a compact binary format proprietary to Autodesk, while DXF is an open ASCII text exchange format supported by almost all CAD software.