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π 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 β 3857
EPSG:27700 support
Batch conversion
Copy results
Input
Result
Enter coordinates and click Convert.
π Common CRS Reference
EPSG:4326 (WGS84) Geographic. Used by GPS, GeoJSON. Units: degrees. Range: X β180β180, Y β90β90.
EPSG:3857 (Web Mercator) Projected. Used by Google Maps, OSM tiles. Units: meters. Range: Β±20,037,508m.
EPSG:27700 (British NGrid) Projected. Used for UK mapping. Units: meters. Origin: Cornwall, SW England.
About this tool
The PixelForge CRS Converter transforms geographic coordinates between common Coordinate Reference Systems including WGS84 (EPSG:4326), Web Mercator (EPSG:3857), and other EPSG codes. Different mapping platforms, databases, and spatial datasets use different CRS standards, and mismatched coordinate systems are a leading cause of geospatial errors. Enter your coordinates, select the source and target CRS, and get the converted values instantly β no GIS software required.
Frequently Asked Questions
A CRS is a mathematical framework that defines how coordinates relate to positions on the Earth's surface. Different CRS standards use different projections, datums, and units.
EPSG:4326 (WGS84) uses degrees of latitude and longitude and is the standard for GPS, GeoJSON, and most web APIs. EPSG:3857 (Web Mercator) uses metres and is used internally by Google Maps, OpenStreetMap, and most web tile services.
The current tool converts single coordinate pairs. For batch conversions, consider using GDAL's ogr2ogr command-line tool or Turf.js in a script.
EPSG:3857 coordinates are in metres from the origin and can reach values in the millions for locations far from the equator. This is normal.
GeoJSON files must use WGS84 (EPSG:4326) per the RFC 7946 standard. Always convert to EPSG:4326 before saving as GeoJSON.