Check one or hundreds of Brazilian CPF numbers at once, with the reason each one fails.
With or without dots and dash. Commas and semicolons also separate entries. Up to 1000 per check.
Paste a CPF to check it as you type.
Validation runs entirely in your browser. No CPF is sent or stored. A valid result means the number is well formed, not that it is registered or active at the Receita Federal.
This CPF validator checks Brazilian taxpayer numbers against the official check digit algorithm while you type. Paste a single CPF or a whole column from a spreadsheet, one per line, with or without dots and dash, and each entry gets a verdict. For valid numbers you get the masked version (000.000.000-00) and the fiscal region that issued it, read from the 9th digit. For invalid ones the tool tells you exactly why: wrong length, stray characters, a repeated-digit sequence like 111.111.111-11, or which of the two check digits is off and what it should be. It also catches CPFs that lost their leading zeros in Excel. Use it to clean imported data, debug a form that rejects input, or check test fixtures. Everything runs locally in your browser.