Validate postcode
Check the NNNN-NNN format and turn 1000001 into 1000-001.
On this device: nothing is uploaded.
How it works
A Portuguese postcode has seven digits in the form NNNN-NNN and does not start with 0. The tool checks the format and adds the hyphen if missing.
Format only. Whether a code exists needs the CTT database.
FAQ
Does it check that the code exists?
No, only the format.