🌍 Geo Tool

CRS Converter

Convert coordinates between common CRS systems: WGS84 (EPSG:4326), Web Mercator (EPSG:3857), and British National Grid (EPSG:27700).

EPSG:4326 ↔ 3857

EPSG:27700 support

Batch conversion

Copy results

Input

From CRS

Longitude / X

Latitude / Y

To CRS

Result

Enter coordinates and click Convert.

📚 Common CRS Reference

EPSG:4326 (WGS84)
Geographic. Used by GPS, GeoJSON. Units: degrees. Range: X −180→180, Y −90→90.

EPSG:3857 (Web Mercator)
Projected. Used by Google Maps, OSM tiles. Units: meters. Range: ±20,037,508m.

EPSG:27700 (British NGrid)
Projected. Used for UK mapping. Units: meters. Origin: Cornwall, SW England.