DWG is a file format designed to store 2D and 3D design data. Sadly, Windows operating systems don't provide you with a default utility for viewing these files. For this reason, programs like DWG FastView were created.
This application comes with a user-friendly interface, provides you with multiple view modes, and offers you a quick way to print your graphic designs. Furthermore, it brings you a wide range of DWG printing options which can easily be configured even by a beginner.
DWG FastView enables you to zoom in over any section from the graphic design and display only the drawing elements that you need.
My only issue with this application is the fact that it supports a limited amount of output formats. To be more exact, the utility lets you export your graphic designs only to two formats: DWG and DXF. Hence, image formats (JPEG, PNG, PDF, etc.) are not supported. Still, this app is a DWG viewer, not a file converter, so this feature isn't extremely necessary.
In conclusion, you should give this program a try if you're looking for an efficient and simple-to-handle DWG viewer.