what3words for OS Maps

Tracking since Apr 19, 2026.

Changelog

• Jun 7, 2026
  description

  Search and display what3words addresses in explore OS maps 
  
  Search and display what3words addresses in explore OS maps 
  
  The what3words for explore OS maps extension allows you to search a what3words address (in all 60 what3words available languages) within explore OS maps and display it as a pin on the map. It also allows you display the what3words address of any location when you click on the map. 
  
  Installation Guide:
  Step 1: Install the Extension
  
  - Click "Add to Chrome" to install the extension
  - Once installed, you'll see the what3words icon in your browser's toolbar
  
  Step 2: Get Your what3words API Key
  
  - Visit developer.what3words.com to create a free account
  - Sign up with your email address and create a password
  - After logging in, navigate to the "API Keys" section
  - Click "Create New API Key" and give it a name (e.g., "Chrome Extension")
  - Set the "Public Domain" to "localhost" for personal use
  - Accept the terms and conditions and click "Create Key"
  - Your new API key will appear on the screen - copy this key
  
  Step 3: Configure the Extension
  
  - Click on the what3words extension icon in your Chrome toolbar
  - Paste your API key into the field labeled "what3words API Key"
  - Click "Save" to store your API key
  - You'll see a confirmation message when your key is successfully validated
  
  Step 4: Start Using the Extension
  
  - Navigate to explore OS maps 
  - Click anywhere on the map to see the what3words address for that location
  - Use the search feature in the overlay to look up what3words addresses
  - Click on any address to open it on the what3words website, or use the copy button to share it
  
  Note: You will need a what3words API subscription to use this extension. More information pricing here: https://accounts.what3words.com/select-plan

  Enables what3words functionality on the OS Maps website:
  
  1. See the what3words addresses of locations on OS Maps instantly.
  2. Search for locations on OS Maps using what3words.
  
  Please note that a what3words API key is required to use this plugin.

• Jun 7, 2026
  short_description

  Add what3words functionality to OS Maps platform for precise location addressing

  Enables what3words functionality on OS Maps. API key required.

• Jun 7, 2026
  host_permissions

  https://api.what3words.com/*, https://explore.osmaps.com/*

  https://explore.osmaps.com/*, https://api.what3words.com/*

• Jun 7, 2026
  permissions

  storage, activeTab, scripting, commands

  sidePanel, tabs, storage

Permissions & access

Permissions

sidePaneltabsstorage

Host access

https://explore.osmaps.com/*, https://api.what3words.com/*

Screenshots

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