Mathematical validation is not official lookup
The check-digit algorithm catches many typing errors, but it does not query official registries. Real data requires an authorized source and legitimate purpose.
Safe use in development
Prefer synthetic data in automated tests, documentation and staging. Never use generated numbers to impersonate real identity or bypass third-party validation.
For tests, synthetic CPF/CNPJ is a technical tool; for real decisions, use official sources and proper legal basis.