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Accurate, up-to-date maps that offer the most convenient way to add detailed OS data to your application.

Get started for free

Easy to access and use from the OS Data Hub. Benefit from up to £1,000 of free premium data every calendar month, as well as free development mode.

Up-to-date, detailed maps

Benefit from unrivalled levels of detail in your GIS, web or mobile app. OS Maps API contains OS MasterMap Topography Layer, 1:25 000 Scale Colour Raster and more data layers.

World class cartography

Choose from four intricate styles, each designed for different use cases; from our renowned Leisure maps to our Light style - perfect for overlaying your own data. 

Easy to use

Easy to use

OS Maps API is interoperable with most geospatial software; you can access the maps via OGC standard Web Map Tile Service (WMTS) or RESTful ZXY. It can be used with all popular GIS software and web mapping libraries including Mapbox GL JS, Leaflet, OpenLayers and ArcGIS API for JavaScript.

We have lots of online developer support to help you get started and find inspiration; from detailed documentation to copy and paste code examples.

Choose the right map for you

Choose the right map for you

With OS Maps API you have a choice between four map styles and two projections so you can use the map that meets your use case. Available in both British National Grid and Web Mercator, you can choose between Road, Outdoor and Light styles or use our Leisure maps available in British National Grid.

Whether you're working on a consumer app, store locator, environmental reporting or any other geospatial application, we have the maps for you.

Make decisions with confidence

Make decisions with confidence

Add detailed geographic context to your data and make location-based decisions with confidence. With consistent coverage from coast to coast, this API works great from a National scale, right down to individual building level. OS Maps API contains accurate data including OS MasterMap Topography Layer - so you can benefit from the detail of every building, road outline, lake, fence and much more.

If you're developing geospatial data visualisations or dashboards, OS Maps API can help take your analysis to the next level.


Key FeaturesWhat this product offers
FormatWMTS and ZXY​
Data structureRaster (256x256px @ 96dpi PNG tiles)​
Scale​ From National to building-level​
Update Frequency​OS MasterMap Topography Layer - six-weekly, 1: 25 000 Scale Colour Raster - quarterly, 1: 50 000 Scale Colour Raster - quarterly, OS Open Zoomstack - six-monthly, MiniScale - annually, 1: 250 000 Scale Colour Raster - annually
Projection​British National Grid (EPSG: 27700) and Web Mercator (EPSG: 3857)
Availability​99.9% uptime ​
Supply​Access via the OS Data Hub
Coverage​Great Britain​


OS Data Hub plans

  • OS OpenData APIs (unlimited access).
  • Free for creating apps, products and services for 3rd parties including the public.
  • Free for internal business use.
  • See the OS Data Hub Plans page for more information.


Case studies

Up-to-date maps in minutes

How location data saves both time and money for the National Library of Scotland

Using OS data to help fix the housing market

How Sprift, a UK tech start-up and OS Partner has used brought together location intelligence on any property in the country, in one place, online.