Search and identify the top Coordinate Reference Systems, datums, and projections. Lookup EPSG 4326, 3857, 27700, and standard UTM zones.
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The EPSG registry provides unique numerical identifiers for every coordinate reference system (CRS) on earth, standardizing how mapping software interprets latitude, longitude, and grid coordinates.
Use the explorer above to verify the properties of common EPSG codes. Never guess an EPSG code for an engineering project —mixing up NAD83 variants or selecting the wrong UTM zone will systematically corrupt your dataset.
EPSG originally stood for the European Petroleum Survey Group. The registry is now maintained by the International Association of Oil & Gas Producers (IOGP) Geomatics Committee.
EPSG:3857 is Web Mercator, designed for web mapping visually, not for accurate measurement. It dramatically inflates the size of objects far from the equator, making Greenland appear as large as Africa.
Coordinate accuracy varies by device and datum. Do not use these results for legal or construction purposes without checking:
GPS Accuracy Alert
Your phone's GPS can be off by 30 meters. This can cause critical errors in your data.
Check My Accuracy →Datum Shift Risk
Using the wrong coordinate system (e.g. WGS84 vs NAD83) creates a permanent 1-meter offset.
Verify My Datum →