CAD Viewer is a professional tool for viewing DWG, DXF, DWF & more (no conversion needed), with zoom, pan, layer control & precise measurements (length/angle/area). Add ​non-destructive annotations​ (arrows/text boxes), view ​3D models​ (STEP/IGES/STL) in axonometric/perspective views, and use ​freehand drawing tools​ (shapes/brush) + ​unit converter​ (mm↔inch, material weight calc).