What Program Opens DWG Files
The DWG format is the native file type for AutoCAD, so the primary program that opens DWG files is Autodesk AutoCAD itself. If you do not have a full AutoCAD license, several other applications can view, edit, or convert these files, ranging from free viewers to professional CAD suites.
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Autodesk Products
Autodesk offers a few paths to opening DWG files beyond the flagship AutoCAD desktop app. AutoCAD LT provides a lighter, 2D-focused option, while AutoCAD Web App lets you open and edit DWG files in a browser with an Autodesk account. These are the most compatible options for complex or heavily annotated drawings.
Third-Party CAD and Viewer Software
Several non-Autodesk programs handle DWG files. DraftSight is a popular 2D CAD editor with strong DWG compatibility. CorelCAD supports both 2D drafting and basic 3D modeling and reads DWG natively. For viewing only, DWG TrueView (a free Autodesk tool) and Bluebeam Revu are common choices in professional workflows.
Free and Online Options
If you need a quick look without installing software, free online viewers such as Autodesk Viewer, A360 Viewer, and ShareCAD can open DWG files directly in the browser. LibreCAD is an open-source desktop alternative that can import some DWG files, though compatibility varies with newer DWG versions.
How to Choose
The right program depends on what you need to do. For full editing, a full CAD editor like AutoCAD or DraftSight is safest. For lightweight viewing or markup, a dedicated viewer like DWG TrueView or a browser-based tool is faster and simpler.