Coordinate converter
Convert between WGS84, GCJ02 and BD09 — the fix for the China map offset problem.
How to use
- Enter decimal coordinates as latitude, longitude — e.g. 39.9042, 116.4074.
- Choose the coordinate system your input uses.
- Hit "Convert" to get the other two systems; use "Copy" to save a result.
WGS84 is the GPS and international standard. GCJ02 is the offset coordinate system required in mainland China (nicknamed "Mars coordinates"), used by AMap and Tencent Maps. BD09 adds a further offset on top of GCJ02 and is used by Baidu Maps. The same spot can differ by 100–700 m across systems, so convert before reusing coordinates in another map service.
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