Validate NIF
Check that a Portuguese NIF/NIPC has a valid check digit.
On this device: nothing is uploaded.
How it works
A NIF has 9 digits; the last is computed from the first 8 (weights 9 to 2, modulo 11). This tool applies that rule and tells you whether the number is well formed.
A correct check digit does not prove the number exists or belongs to anyone; only the tax authority can confirm that. The type hint comes from the first digit and is indicative only.
FAQ
Is the number stored?
No. It is computed locally and never sent.