One workflow across borders
US ZIP, UK outcode, German PLZ and Japanese 〒 in the same box. There is no second tool when the destination changes, and no context switch between markets.
COMPARE · POSTCODEDOG VS POSTCODES.IO
PostcodeDog vs Postcodes.io
82 countries from one lookup, not just the UK.
Postcodes.io is a clean, developer-friendly API for UK post codes. PostcodeDog covers 82 countries behind one search box, so the same workflow still works when the next order ships to Japan, Germany or Brazil.
SIDE BY SIDE
What changes with PostcodeDog
| Capability | UsPostcodeDog | Postcodes.io | Why it matters |
|---|---|---|---|
| Coverage | 82 countries in one lookup | United Kingdom only | The next order may not be a UK address. |
| Interface | Lookup page, batch page and API in one product | API-first; endpoints and documentation | Non-developers can answer without a client. |
| Input | Paste an address, city or code; format detected | Post code, place or coordinate endpoints | Support can use the customer’s text as-is. |
| Batch | Paste up to 50 rows, review, export CSV | Bulk endpoints for developers | Operations can clear a queue without writing a script. |
| Languages | 13 interface languages | English documentation and API | Local teams work in their own language. |
| AI agents | Built-in MCP server at /mcp | — | Connect the lookup to Claude, Cursor or an internal agent. |
WHERE POSTCODEDOG WINS
A global lookup beside a focused UK API.
Support-friendly batch
Paste a column, review the statuses and export CSV. The batch page is built for the person clearing labels, not only for the developer who can write a bulk request.
The same lookup for humans and agents
The web box, JSON API and MCP server share one resolver, so a support answer and an agent answer start from the same place.
TRY IT
Try the difference
Paste a full address, a city or a post code. Country and format are detected.
Free. No account, no API key.THE LOOP
Paste → resolve → verify
The same three steps work whether the address is a US ZIP, a UK outcode or a Japanese 〒.
- 01
Paste what you have
A full address, a city, or just a code. The parser accepts the whole line.
- 02
Confirm the place and format
Country, region and post code format are shown together, with nearby codes for a second option.
- 03
Send it to the label
Copy the verified code or export the batch. Platform and carrier pages keep local rules in view.
About
About Postcodes.io
Postcodes.io is an open-source UK post code and geolocation API maintained by Ideal Postcodes. It provides post code validation, lookup, reverse geocoding and bulk endpoints for UK post codes.
PostcodeDog is a hosted lookup for 82 countries. It is not a UK-only API; it is the box a support team uses when the destination changes every order.
When PostcodeDog is the better fit
- 01Your destinations cross borders, not just the UK.
- 02Support needs a lookup page, not only an API.
- 03You want batch checks and CSV export without a script.
- 04You want an MCP server for AI clients.
Is PostcodeDog a UK post code API?
It covers the UK and 81 other countries. The UK is one country in a global lookup, not the whole product.
Can PostcodeDog check UK post codes?
Yes. The UK is one of 82 countries. The same lookup also covers the US, Japan, Germany and more, so a UK check does not need a second tool.
Can I check multiple codes?
Yes, up to 50 rows in the browser with CSV export.
Can I use it from an AI client?
Yes. The MCP server is at /mcp and needs no account.
Compare
Look beyond one country.
Try a UK outcode, a US ZIP and a Japanese 〒 in the same box.