AnyTools
🌍

Coordinate Converter

Support batch conversion between WGS84 (GPS), GCJ02 (China Mars), BD09 (Baidu) coordinate systems.

From System
WGS84
To System
GCJ02
Batch Input (one coordinate per line)
Input LongitudeInput LatitudeOutput LongitudeOutput LatitudeActions

❓What is Coordinate System Conversion

Coordinate system conversion is the process of transforming geographic coordinates between different reference systems. The main systems include WGS84 (World Geodetic System 1984, used by GPS), GCJ02 (China Geodetic Coordinate System 2000, also known as Mars Coordinates, used by most Chinese map services), and BD09 (Baidu Coordinate System, used by Baidu Maps). These conversions are essential for map applications, location-based services, and navigation systems operating in different regions, especially when working with Chinese mapping services.

✨Features

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3 Coordinate Systems

Support WGS84, GCJ02 and BD09 bidirectional conversion.
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Batch Conversion

Support multiple coordinates conversion at once with table view.
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CSV Export

Export conversion results as CSV file for further processing.
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Real-time Conversion

Instant conversion with high precision calculation algorithm.

🎯Use Cases

Map applications and navigation

Convert GPS coordinates (WGS84) to formats compatible with Chinese map services (GCJ02, BD09) for integration with Amap, Baidu Maps, and Google Maps China. Essential for navigation apps, delivery services, vehicle tracking, and fleet management systems operating in mainland China.

Mobile app development

Integrate coordinate conversion into iOS and Android apps to ensure GPS-captured locations display correctly on Chinese maps. Useful for ride-sharing apps, food delivery services, real estate apps, and location-based services requiring compatibility with multiple map systems.

Geographic data analysis

Convert large coordinate datasets between systems for GIS analysis, geographic research, and sensor data processing. Useful for researchers, data analysts, and developers working with location data from multiple sources who need to standardize formats for comparative analysis.

Enterprise system integration

Synchronize location data between systems using different coordinate formats. Essential for ERP systems, logistics platforms, warehouse management systems, and enterprise applications integrating GPS data, IoT devices, and Chinese and international map services.

📚Practical Guide

WGS84 (World Geodetic System 1984)

WGS84 is the standard coordinate system used by GPS satellites worldwide. It is based on the Earth ellipsoid model and provides accurate global positioning. Most international mapping services and GPS devices use WGS84 coordinates directly.

GCJ02 (China Geodetic Coordinate System 2002)

GCJ02, also known as Mars Coordinates, is the mandatory coordinate system for Chinese maps regulated by the State Bureau of Surveying. It applies an obfuscation algorithm to WGS84 coordinates for national security reasons. Services like Amap (Gaode) and Google Maps China use GCJ02.

BD09 (Baidu Coordinate System 2009)

BD09 is Baidu's proprietary coordinate system developed in 2009. It applies additional encryption on top of GCJ02, making it incompatible with other map services. Baidu Maps exclusively uses BD09 coordinates, requiring conversion when integrating with other systems.

Conversion Algorithm

The conversion uses mathematical transformation formulas including coordinate offset calculation, ellipsoid parameter correction, and encryption algorithm reversal. WGS84↔GCJ02 uses China's official encryption algorithm, while GCJ02↔BD09 uses Baidu's proprietary algorithm with polar coordinate transformation.

💬Frequently Asked Questions

❓Why do I need a coordinate converter?
Different mapping services and GPS systems use different coordinate systems. WGS84 is the global GPS standard, GCJ02 is used by Chinese mapping services (like Google Maps China), and BD09 is used by Baidu Maps. Converting between these systems is essential for accurate location data when working with international and Chinese mapping services, GPS devices, and geographic information systems.
💬What coordinate systems are supported?
The tool supports three major coordinate systems: WGS84 (World Geodetic System 1984), the global GPS standard used worldwide; GCJ02 (also known as Mars coordinate system), used by Chinese mapping services including Google Maps China and Gaode Maps; and BD09, used by Baidu Maps. All conversions are bidirectional, allowing you to convert from any system to any other system.
🔍How accurate are coordinate conversions?
Conversions use standard algorithms with high precision. WGS84 to GCJ02 and GCJ02 to BD09 conversions maintain accuracy within meters, suitable for most mapping and navigation applications. The tool processes coordinates with sufficient decimal precision to ensure accurate results for GPS coordinates, mapping services, and geographic data analysis.
💡Can I convert multiple coordinates at once?
Yes, the tool supports batch conversion. You can add multiple rows of coordinates, import coordinates from CSV files, or paste multiple coordinates in batch input format (one coordinate per line). All coordinates are converted simultaneously, and you can export the results to CSV for further processing or analysis.
📚Are my coordinate data processed securely?
Yes, all conversions are performed entirely in your browser using client-side JavaScript. Your coordinate data never leaves your device or is uploaded to a server. All calculations occur locally in your browser's memory, and data is discarded when you close the page, ensuring privacy for sensitive location data.

💡How to Use

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Coordinate Format

Use decimal degrees format (e.g., 116.397428, 39.90923), not degrees-minutes-seconds.
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Precision

Results are displayed with 6 decimal places, providing meter-level accuracy.
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China Region

GCJ02 offset only applies within China mainland. Coordinates outside China remain unchanged.
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API Integration

The conversion algorithm can be integrated into your own applications for automated processing.

🔗Related Documents

📖WGS84 Official SpecificationWorld Geodetic System 1984 technical documentation.
📄China Surveying and Mapping LawRegulations on geographic information security in China.
🗺️Coordinate Transformation AlgorithmMathematical principles of coordinate system conversion.
🔗eviltransform LibraryOpen source coordinate conversion library implementation.
📚Geodetic Coordinate SystemsComprehensive guide to global coordinate systems.

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