United Kingdom · Validation

UK postcode validator.

Normalize a UK postcode and check its outward/inward shape locally, then use Royal Mail for the live address record.

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Check a postcode

Spacing is added for you. This is a format check, not proof that a delivery point exists.

Result

Enter a postcode and press Validate.

Open official lookup ↗

What this check means

UK postcodes have an outward code, a space, and a three-character inward code. This checker also accepts the special GIR 0AA shape. A postcode can pass the shape check and still be retired, unassigned, or incomplete for a particular address.

Official source and freshness

Checked 2026-09-29 against Royal Mail Postcode Finder, which uses Royal Mail’s Postcode Address File (PAF). Royal Mail is the authority for a live address result and deliverability.

Privacy

The format check runs entirely on this device. The postcode is not sent to TNAADO, saved, or logged. Use Royal Mail’s finder when you need a live lookup.

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