CAD to KML/KMZ converter

Pick the one the drawing was made in. Most US survey and civil drawings use State Plane in US survey feet, like NAD83 / Pennsylvania South (ftUS), EPSG 2272. Some use UTM in meters. Ask the person who made the drawing, or look in the title block or the drawing notes. Not sure which State Plane zone the job is in? Use the State Plane zone finder.

If the drawing is in local coordinates (like a site plan that starts at 5000, 5000), it is not tied to the earth, and no setting here will place it right.

Lines, polylines (with curved segments), arcs, circles, ellipses, points, text and blocks. Each CAD layer becomes its own folder in the KML. Splines are drawn through their fit points (or control points), so they are close but not exact. Hatches, dimensions, 3D solids, images and tables are skipped, and the tool tells you how many. Heights are dropped: everything is drawn on the ground.

We use proj4js to reproject to WGS 84 lat/long, which is what KML uses. NAD 83 and WGS 84 are treated as the same here, so results can be off by up to about 6 ft (2 m). That is fine for a map overlay or flight planning. Do not use the KML for staking or boundary work.

The file is read in your browser. Nothing is uploaded. DWG files are read with LibreDWG, which loads about 11 MB the first time you open a DWG. Very large drawings (over 600,000 points) are stopped so your browser does not freeze. Open-source parts: licenses.