In the worlds of architecture, civil engineering, and geographic information systems (GIS), few tasks are as common—or as frustrating—as file format conversion. You have spent hours drafting a precise site plan in AutoCAD, saving it as a .DWG (Drawing) file. Now, your client or GIS manager wants that same data overlaid on Google Earth or imported into a mapping application. They want a .KML (Keyhole Markup Language) file.
AutoCAD DWG files usually rely on local coordinate systems (e.g., 0,0 as the building corner) or projected systems like UTM (Universal Transverse Mercator). KML strictly uses —geographic coordinates (latitude/longitude).
50MB per file, but only 2 free conversions per day. No account required.
Zamzar is the oldest online file converter. It works best for simple DWG files that are already georeferenced correctly. It ignores complex CAD entities (blocks, hatches) but converts polylines and points flawlessly.
If a website asks you to download an exe file or a "converter setup" program to use their online service— close the tab immediately . Genuine online converters run entirely in your browser.
For batch jobs, use the again: QGIS with the Processing Toolbox → Batch Processing → Convert format to KML .
MyGeodata is not a sketchy file dropper; it is a legitimate GIS cloud platform. It handles the coordinate system issue better than any other free tool.
Some sites claim to convert DWG to KML but actually just convert the file to a low-resolution image (PNG) wrapped in a KML shell. You lose all vector data. The file size will drop from 10MB to 100KB.