Postcodes.io

Overview

Postcodes.io is a free public API in the Geocoding category. Postcode lookup & Geolocation for the UK.

Geocoding APIs turn addresses into coordinates and back — essential for maps, logistics, and location-aware features.

You can use this API in prototypes, side projects, and production applications — just keep the provider’s usage policy in mind.

Authentication

Postcodes.io requires no authentication — you can start calling it directly, which makes it great for quick experiments and client-side demos.

HTTPS & CORS

• HTTPS: supported — traffic to Postcodes.io is encrypted, so it is safe to use from production apps.
• CORS: enabled — Postcodes.io can be called directly from the browser without a proxy, which simplifies client-side integrations.

Getting Started

1. Read the official documentation: https://postcodes.io
2. Make a test request with curl or your favourite HTTP client.

Rate Limits & Notes

• Rate limits, quotas, and free-tier terms are defined by the provider — always check the official documentation for Postcodes.io before scaling up.
• The upstream listing is community-maintained; fields like auth, HTTPS and CORS reflect the state at listing time and may change.

FAQ

Does Postcodes.io require an API key?

No — Postcodes.io is listed as a no-auth API, so you can call it directly.