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Latitude and Longitude Coordinate Converter
Supports coordinate system conversion such as WGS84, GCJ02, and BD09, degree-minute-second format conversion, planar projection conversion, and batch processing.
Supports conversion between multiple coordinate systems and projections, including Amap (GCJ-02), Baidu Maps (BD-09), GPS (WGS-84), Web Mercator, and common engineering projections.
Provides sample data, 7-parameter settings, batch processing, format detection, map view, and round-trip error analysis
Sample Coordinate Data
WGS-84 is the international standard GPS coordinate system, used worldwide
For Beijing 54, Xi'an 80, and project-level CGCS2000 conversion, enter engineering 7 parameters. If blank or all 0, it is treated as approximately the same datum and a note is shown.
Range: -180° ~ 180°
Range: -90° ~ 90°
Degrees
Minutes
Seconds
Degrees
Minutes
Seconds
Enter coordinates and click Convert
Supports coordinate systems, projections, batch, and format detection
Coordinate Validation Result
Coordinate System Info
Common Coordinate Systems
Coordinate System
Use Case
Accuracy
WGS-84
GPS, international standard
Global standard, high accuracy
GCJ-02
Amap, Tencent Maps
Optimized for China
BD-09
Baidu Maps
Baidu-specific encryption
CGCS2000
Official Chinese Standard
Highest Accuracy in China
Conversion Accuracy
WGS-84 ↔ CGCS2000: sub-meter accuracy
WGS-84 ↔ GCJ-02: meter-level accuracy
GCJ-02 ↔ BD-09: meter-level accuracy
Projection conversion: standard formulas; accuracy depends on ellipsoid and zone parameters
Note:Conversion accuracy is affected by original coordinate accuracy, location, and other factors
Enter coordinates and click Convert
Supports TXT, CSV, GeoJSON, and WKT text formats; auto-detects commas, spaces, tabs, POINT, and GeoJSON Point.
File preview (first 20 lines):
No.
Longitude
Latitude
0%
Coordinate System Accuracy Comparison
Accuracy Comparison Results
Enter coordinates and start comparison
Analyze coordinate offsets and round-trip errors between coordinate systems
Instructions
Software Usage Instructions
Coordinate System Conversion:
Select the input coordinate system (WGS-84, CGCS2000, GCJ-02, BD-09)
Enter longitude and latitude coordinates; decimal degrees or degrees-minutes-seconds format is supported
Click the "Degrees-Minutes-Seconds/Decimal Switch" button to switch the input format
Click the "Convert Coordinates" button, and the system will display the results in all coordinate systems
Plane Projection Conversion:
Select the coordinate system, projection method (UTM, Gauss-Krüger, Mercator), and zone method
Select the conversion direction: longitude/latitude → plane coordinates or plane coordinates → longitude/latitude
Enter the corresponding coordinate data and click "Convert Projection" to get the result
The central meridian can be calculated automatically or specified manually
Batch Conversion:
Upload a coordinate file in TXT, CSV, or XLSX format
File format requirement: one coordinate point per line, longitude,latitude (separated by commas, spaces, or tabs)
Select the input coordinate system and target coordinate system
Click "Start Batch Conversion", and the system will process all coordinate points
Download Results:After the conversion is complete, you can download the result file in CSV, TXT, or XLSX format.
FAQ
A: WGS-84 is the GPS standard coordinate system; GCJ-02 is China’s encrypted “Mars” coordinate system, used for domestic map services; BD-09 is the coordinate system used by Baidu Maps; CGCS2000 is the China Geodetic Coordinate System and is basically consistent with WGS-84. Offsets exist between different coordinate systems, so conversion is required for correct use.
A: In degrees-minutes-seconds format, enter the three values for degrees, minutes, and seconds separately, and select the direction (east/west longitude, north/south latitude). For example, Beijing’s coordinates are 116 degrees 23 minutes 50.64 seconds east longitude, 39 degrees 54 minutes 33.48 seconds north latitude. The system supports two-way conversion between degrees-minutes-seconds and decimal formats.
A: Planar projection conversion converts spherical latitude and longitude coordinates into planar rectangular coordinates. It is commonly used in surveying and mapping engineering, engineering surveying, and cartography. UTM projection is suitable worldwide; Gauss-Krüger projection is a commonly used projection method in China; Mercator projection is often used for nautical charts.
A: In theory, batch conversion supports any number of coordinate points, but it is limited by device memory and performance. It is recommended to process no more than 100,000 coordinate points at a time. If you need to process larger datasets, you can do so in batches. The system displays processing progress to ensure stable handling of large volumes of data.
A: The tool uses standard coordinate conversion algorithms, and conversion accuracy can reach meter level. Conversion errors between WGS-84 and GCJ-02 are usually within a range of several meters to several dozen meters, meeting the needs of most applications. For high-precision measurement applications, professional surveying and mapping software is recommended.
A: Coordinate conversion algorithms are mainly optimized for mainland China. For regions outside China, the WGS-84 and GCJ-02 coordinate systems are basically the same, so no offset conversion is performed. Conversion accuracy may vary in Hong Kong, Macao, Taiwan, and overseas regions.
A: TXT, CSV, and XLSX files are supported. Each line should contain one coordinate point, with longitude and latitude separated by a comma, space, or tab. For example: 116.3974,39.9093 or 116.3974 39.9093. UTF-8 file encoding is recommended to support Chinese.
A: All coordinate conversions are completed locally on your device. Coordinate data is not uploaded to the server, ensuring data security and privacy protection. Batch conversion is also performed locally, and the result file can be downloaded immediately after conversion is complete.
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