An address validation API confirms that a UK address is correct, complete and deliverable, then standardises it. AutoPostcode validates every address against the Royal Mail Postcode Address File so only clean, usable data enters your systems.
Why validate addresses
- Consistent, standardised formatting across every record
- Fewer failed deliveries and returns
- Cleaner data for analytics, billing and CRM
- Official PAF accuracy across 30M+ UK delivery points
Validation vs verification
Validation confirms an address is well-formed and exists; verification confirms it's deliverable. AutoPostcode handles both from the same PAF-backed source.
Part of the postcode lookup hub
This page belongs to the postcode lookup API hub alongside address lookup and address autocomplete.
Frequently asked questions
What is an address validation API?
An address validation API checks that an address is correct, complete and deliverable, then returns it in a standardised structure. AutoPostcode validates against Royal Mail PAF data.
What's the difference between validation and verification?
They're closely related: validation checks an address is correctly formatted and exists, while verification confirms it's deliverable. AutoPostcode does both using PAF.
Can I validate addresses in bulk?
Yes — validate addresses at the point of entry or run existing records through the API to clean your database.
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