Convert GCJ02 coordinate system (Mars Coordinate System) to WGS84 coordinate system
Use precise reverse coordinate conversion algorithm
Process locally, protect data privacy
Output universal WGS84 coordinate results
Convert coordinates from GCJ02 system to WGS84 system
Enter GCJ02 coordinates from Amap, Tencent Maps, or other domestic sources — one point per line, single points or large batches both work.
Click Convert and the tool iteratively reverses the Mars Coordinate offset to recover the original WGS84 values, keeping the residual error to about one meter.
Copy the results or export them as CSV/JSON for Google Earth, QGIS, and other international tools. The conversion is free and never leaves your browser.
AThe forward GCJ02 transform is non-linear, so the reverse direction is solved by numerical iteration rather than an exact formula. Each round-trip typically leaves an error of around 1 meter or less, which is invisible at map scale.
AWhenever data captured on domestic Chinese maps must be used in WGS84-based systems: Google Earth, handheld GPS units, international basemaps, or standard GIS workflows. Without it, your points will be shifted several hundred meters.
ANo. It is ideal for mapping, data integration, and development work, but official surveying in China requires authorized transformation services. Treat the output as approximate to the meter level.