Postcode / ZIP Validator
Check a postal code's format for common countries.
Key features
Pick a country and type a postal code to instantly check whether it matches that country’s format. This only checks formatting — like a US ZIP being 5 digits, or a UK postcode matching its letter-number pattern — not whether the code actually exists. Everything runs locally in your browser.
How to use
Pick a country
Choose which country's postal code format to check against.
Type the code
The result updates instantly as you type.
Frequently asked questions
Does this confirm the postal code actually exists?
No — this only checks that the code matches the correct format for the selected country (the right number of digits or letters, in the right pattern). It doesn't look up whether that specific code is a real, assigned postal code.
My country isn't listed — what should I do?
This covers 10 of the most commonly checked countries. If yours isn't here, this tool can't validate its format yet.
Is the postal code I enter sent anywhere?
No — the check is a simple pattern match performed entirely in your browser.