Check whether a Brazilian CPF (person) or CNPJ (company) passes the official check-digit algorithm. Useful for forms, QA, and cleaning imported data.
Paste or type the value to check.
Select the document/format type if the tool has modes.
Read the valid / invalid result — checksum success is not the same as official registry status.
Brazilian CPF and CNPJ numbers include check digits computed from the preceding digits. This tool verifies that math and basic length/format — it does not query government databases or confirm that a number is active, registered, or belongs to a real person or company. Use it for client-side validation and data hygiene before you call an official API.
Enter a value in CPF & CNPJ Validator to test format and check digits. A “valid” result means the value passes algorithmic checks — not that it exists in an official database.
Strip spaces if the tool expects digits only. Never use test generators to impersonate real people or companies.
Whenever possible, CPF & CNPJ Validator processes your data locally with JavaScript in this page. That means drafts, secrets, and unfinished work stay on your device by default. Prefer this workflow when you do not want to upload sensitive text, tokens, passwords, or files to a third-party service.
No. It only means the check digits match the algorithm. A fabricated but well-formed number can still pass.
No. Validation runs entirely in your browser.
For most FlyUtils tools, no. Processing happens in your browser with JavaScript. If a tool ever needs a server, that will be stated clearly on the page.
Yes. CPF & CNPJ Validator is free, with no sign-up and no artificial usage caps for normal personal and work use.
Yes. The page is mobile-first, so you can paste input, tweak options, and copy results from a phone or tablet.