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Coord Convert

ExtensionTools
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Overview

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

Details

  • Version
    1.3.4
  • Updated
    August 11, 2026
  • Size
    126KiB
  • Languages
    English
  • Developer
    Email
    ylf4050@gmail.com
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

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The developer has disclosed that it will not collect or use your data. To learn more, see the developer’s privacy policy.

This developer declares that your data is

  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes

Support

For help with questions, suggestions, or problems, visit the developer's support site

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