Coordinate Conversion Toolbox

Professional coordinate conversion between WGS84, GCJ02, BD09, and BD09MC. Built for GIS developers, surveyors, and data analysts. Free, accurate, and open source.

Start Converting API Docs

All Conversion Tools

Choose from 10 coordinate conversion tools.

WGS84 → GCJ02

Convert WGS84 (GPS) coordinates to GCJ02 (Mars coordinates) used by Chinese map services.

GCJ02 → WGS84

Convert GCJ02 (Chinese map coordinates) back to standard WGS84 GPS coordinates.

GCJ02 → BD09

Convert GCJ02 coordinates to BD09 (Baidu) coordinate system with additional offset.

BD09 → GCJ02

Convert BD09 (Baidu) coordinates back to GCJ02 (Mars) coordinate system.

WGS84 → BD09

Convert WGS84 GPS coordinates directly to BD09 (Baidu) coordinate system through GCJ02.

BD09 → WGS84

Convert BD09 (Baidu) coordinates back to standard WGS84 GPS coordinates through GCJ02.

BD09 → BD09MC

Project BD09 geographic coordinates to BD09MC (Baidu Mercator) planar coordinates in meters.

BD09MC → BD09

Convert BD09MC (Baidu Mercator) planar coordinates back to BD09 geographic coordinates.

WGS84 → BD09MC

Convert WGS84 GPS coordinates directly to BD09MC (Baidu Mercator) planar coordinates.

BD09MC → WGS84

Convert BD09MC (Baidu Mercator) planar coordinates back to WGS84 GPS coordinates.