test CPF generator
A valid CPF is not drawn at random: its last two digits come from a calculation over the first nine. This page closes that calculation with a concrete number before you generate your own in the tool.
First digit is 0 because the remainder of dividing by 11 is 1, and any remainder under 2 always becomes digit 0; second digit is 8 because the next remainder is 3, and 11 minus 3 is 8.
Modulo 11 applied to this base returns exactly 11 as the check digits; even so no serious generator hands this CPF out, because the Receita Federal never issues a document with all 11 digits identical.
Base built from repeated triplets (111, 444, 777) precisely to make it obvious it is fictitious; check digit 35 comes from the same modulo-11 pass as the examples above.
There is no such guarantee, in practice, it almost certainly is not. The tool only guarantees the mathematical consistency of the check digits; it does not query the Receita Federal or verify whether the number is assigned to anyone. Always treat it as fictitious data.
No. The generator only closes the modulo-11 calculation over a random base, without querying any registry; the number is synthetic, useful for testing input masks and form validation, and proves nothing about a real registration.
Because the remainder of the weighted sum divided by 11 landed on 0 or 1; the modulo-11 rule converts both cases to digit 0 instead of leaving a negative or two-digit remainder.
Modulo 11 closes normally for repeated sequences, as the 111.111.111-11 example above shows; but the Receita Federal never issues a CPF like that, so generators and validators treat it as a case separate from the arithmetic.
No. The number is meant only for software testing and mask validation in a development environment; using it to impersonate someone else or fill out a real registration is misuse of the document.
The tool draws nine base digits and computes the two check digits with the modulo-11 rule used by form validators. This creates mathematical consistency, not a real identity.
The number is generated locally in the browser. Analytics receives only action, status, type and format, never the generated CPF.