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What is a .dwg file?

A .dwg file is a CAD drawing, normally from AutoCAD — technical plans stored as precise geometry rather than pixels.

This extension has been used by more than one format

20 different formats have claimed .dwg over the years, so two files with the same extension aren't necessarily the same kind of thing.

How to open a .dwg file

  • WindowsAutoCAD
  • WindowsFree DWG TrueView
  • WindowsLibreCAD or DraftSight for basic viewing
  • MacAutoCAD for Mac
  • MacOnline Autodesk Viewer

How to convert a .dwg file

  • Export to .dxf for other CAD programs, or plot to PDF for sharing.

MIME type

When a .dwg file travels over the web, servers label it with this MIME type:

image/vnd.dwg

What's a MIME type?

The technical record

For archivists, developers and the merely curious: these are the PRONOM registry entries for .dwg.

Format nameVersionMIME typePUID
AutoCAD Drawing1.0image/vnd.dwgfmt/21
AutoCAD Drawing1.2image/vnd.dwgfmt/22
AutoCAD Drawing1.3image/vnd.dwgfmt/23
AutoCAD Drawing1.4image/vnd.dwgfmt/24
AutoCAD Drawing2.0image/vnd.dwgfmt/25
AutoCAD Drawing2.1image/vnd.dwgfmt/26
AutoCAD Drawing2.2image/vnd.dwgfmt/27
AutoCAD Drawing2.5image/vnd.dwgfmt/28
AutoCAD Drawing2.6image/vnd.dwgfmt/29
AutoCAD DrawingR9image/vnd.dwgfmt/30
AutoCAD DrawingR10image/vnd.dwgfmt/31
AutoCAD DrawingR11/12image/vnd.dwgfmt/32
AutoCAD DrawingR13image/vnd.dwgfmt/33
AutoCAD DrawingR14image/vnd.dwgfmt/34
AutoCAD Drawing2000-2002image/vnd.dwgfmt/35
AutoCAD Drawing2004-2005image/vnd.dwgfmt/36
AutoCAD Drawing2007-2008image/vnd.dwgx-fmt/455
AutoCAD Drawing2010/2011/2012image/vnd.dwgfmt/434
AutoCAD Drawing2013/2014image/vnd.dwgfmt/531
AutoCAD Drawing2018/2019/2020/2021image/vnd.dwgfmt/1395

Got another one?