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Convert GeoJSON Point/Line/Polygon between WGS84, GCJ-02, BD-09. Runs locally. Coord Convert helps you translate coordinates between the systems used by GPS and China map apps. Systems • WGS84 — GPS / international maps (OpenStreetMap, Google outside CN offset) • GCJ-02 — Amap / Gaode (“Mars” coordinates) • BD-09 — Baidu Maps Workflow • Upload GeoJSON / CSV or paste lon,lat (also from clipboard) • Auto-detect WGS84 vs GCJ-02 vs BD-09 using map lookup + preview • Override the guess if needed, choose a target system, convert • Copy results or download CSV Privacy • All math runs locally in your browser • Map tiles load from OpenStreetMap for preview only • No account — processed on your device How to use 1. Click the Coord Convert icon 2. Paste lon,lat 3. Convert, or use Detect to identify the system 4. Copy the result or run a batch
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