Check whether a CPF, CNPJ, or IBAN passes its checksum rules. Validation runs locally and confirms structure and check digits—not whether the document is issued or active.
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.
CPF and CNPJ use Brazilian check-digit algorithms; IBAN uses the ISO 13616 mod-97 check. Passing validation means the number is well-formed. It does not prove the document exists in a government database or belongs to a specific person or company.
Enter a value in Document 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, Document 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 verifies local checksum and length rules. Nothing is sent to a server or official registry.
Brazilian CPF (11 digits), CNPJ (14 digits), and international IBAN (country code + mod-97 check).
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. Document 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.