Draw a Polygon on a Map and Get Its Coordinates

Coordinate formats

Select the polygon and use the copy buttons in the panel:

Copy lat, lng — one corner per line, latitude first (the order Google Maps uses). The closing point is not repeated:

51.503000, -0.187000
51.503000, -0.151000
51.511500, -0.151000
51.511500, -0.187000

Copy GeoJSON — longitude first, ring closed by repeating the first point:

{"type": "Polygon", "coordinates": [[[-0.187, 51.503], [-0.151, 51.503], [-0.151, 51.5115], [-0.187, 51.5115], [-0.187, 51.503]]]}

Copy WKT — for SQL databases such as PostGIS, MySQL, SQL Server or BigQuery:

POLYGON ((-0.187 51.503, -0.151 51.503, -0.151 51.5115, -0.187 51.5115, -0.187 51.503))

Choose the number of decimals under Export → Coordinate precision (6 decimals ≈ 10 cm).

Using the coordinates

• PostGIS: ST_GeomFromText('POLYGON ((…))', 4326) or ST_GeomFromGeoJSON('…')
• Google Maps JavaScript API: convert the lat, lng list into {lat, lng} objects for google.maps.Polygon
• Leaflet / Mapbox / OpenLayers: use the GeoJSON directly