Coordinate System Converter

Convert coordinates between WGS84 (international standard), GCJ02 (Mars coordinate, used by Chinese maps), and BD09 (Baidu coordinate) coordinate systems. Essential for working with different map services in China.

Input Coordinate System

Latitude

Longitude

How to use:

Select the coordinate system of your input coordinates (WGS84, GCJ02, or BD09)
Enter the latitude and longitude values
Click 'Convert' to get coordinates in all three systems
Copy the results as needed

About Coordinate Systems

WGS84 is the international standard coordinate system used by GPS devices and most international map services. GCJ02 (also known as Mars coordinate) is the Chinese standard coordinate system used by Chinese map services like Gaode, Tencent, and Google Maps China. BD09 is Baidu's coordinate system, which is a secondary encryption based on GCJ02. This tool helps you convert coordinates between these systems, which is essential when working with different map services or when your data comes from different sources.