Turn UK property records into exact coordinates.
Upload a spreadsheet or call the API. UPRNs and postcodes come back as coordinates — with a straight answer about how precise each one is.
Upload a file
Drag in a CSV, Excel file, or zipped shapefile, point at your UPRN, postcode, or address columns, and download the results as CSV, Excel, GeoJSON, KML, or Shapefile — or save them straight to your ArcGIS Online account. Your file never leaves the browser — only the identifiers are sent for matching.
Geocode a fileUse the API
Two endpoints — single and batch. Send a UPRN or postcode, get lat/lon and a precision tier back as JSON. Copy-paste examples in the reference.
Read the docsEvery result tells you how good it is
Most geocoders hand back a pin and let you assume it's right. Here, the precision tier is part of the answer.
The exact building
The record's UPRN matched Ordnance Survey's authoritative coordinate for that addressable location. Rooftop-level.
The postcode's centre
No usable UPRN, so we fall back to the postcode centroid. A UK postcode covers ~15 addresses — expect 50 m to a few hundred metres.
An honest miss
Nothing resolved, and we say so instead of guessing. Unmatched lookups don't count against your allowance.
Try a lookup
A real request against the live API — no account needed.
One price,
no subscription
Start with 1,000 successful lookups free — no card required. One payment unlocks unlimited lookups, forever.
Get a free key- 1,000 lookups free The full tool and API, no card, no time limit.
- Then £20, once Unlimited lookups forever after a single payment.
- Tool and API included Upload spreadsheets or integrate the REST API — one key covers both.
- Unmatched is always free Only successful lookups count against your allowance.
- Every export included CSV, Excel, GeoJSON, KML, Shapefile — and save straight to ArcGIS Online.
- No surprises No monthly fees, no metering, no usage tiers, no upsells.
Common questions
What can it geocode?
UPRNs (exact property match) and UK postcodes (centroid match). If your file only has a full address column, we find the postcode inside it automatically. Matching whole address strings to individual buildings is in development.
Do you store my file?
No. Files are parsed and exports are generated entirely in your browser. Only the UPRNs and postcodes being matched are sent to the API — never the rest of your data.
Where do the coordinates come from?
Open UK public-sector data: energy-certificate records joined to Ordnance Survey's open UPRN coordinates, with postcode centroids from open ONS data. The method and full attributions are on the about page.
What's the coverage?
Property-level matching covers England and Wales. Postcode centroids cover England, Wales, and Scotland. Northern Ireland postcodes are excluded for data-licensing reasons and always return unmatched.