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CPF Validator
Check if a CPF number is valid according to the official algorithm
CPF Validator
The CPF validator checks if a number follows the official algorithm established by the Brazilian Federal Revenue. This tool is useful for:
- Companies that need to validate customer CPFs
- Developers implementing validation in their systems
- Individuals who want to verify the validity of a CPF
Common invalid CPFs
Some CPF numbers are automatically considered invalid, even if they pass the verification algorithm:
- CPFs with all digits the same (e.g., 111.111.111-11)
- CPFs with incorrect format
- CPFs with incorrect number of digits
Did you know?
There are only 11 CPFs with all digits the same (000.000.000-00 to 999.999.999-99), and all are considered invalid by the system.