Default from WGS-84 to Web Mercator, with GCJ-02, BD-09, and custom Proj4 support.
Coordinates, parameters, and results stay in this browser and are not uploaded to Your Free Tools or third-party services.
Convert WGS84, GCJ-02, BD-09, Web Mercator, and custom Proj4 coordinates locally in your browser. WGS84 is the common GPS and standard longitude/latitude system; GCJ-02 is the offset coordinate system used by mainland China internet maps; BD-09 is the Baidu Maps coordinate system; Web Mercator is the web tile map projection; custom Proj4 is for project or engineering coordinate definitions. The default conversion is WGS-84 to Web Mercator. Coordinates, parameters, and results stay in this browser and are not uploaded to Your Free Tools or third-party services.
Supported systems include WGS84, GCJ-02, BD-09, Web Mercator, and trusted custom Proj4 parameters. WGS84 is common GPS longitude/latitude; GCJ-02 is the offset coordinate system used by mainland China internet maps; BD-09 is the Baidu Maps coordinate system; Web Mercator is the web tile map projection; custom Proj4 is for project or engineering coordinate definitions.
Yes. Enter one source coordinate per line. Decimal degrees, longitude/latitude labels, DMS, and compact E/N or N/E formats are supported.
Use custom Proj4 parameters for project, engineering, or local coordinate systems when trusted project documentation provides the parameters.
No. Coordinate input, custom parameters, and results are processed only in the current browser.
