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Alphanumeric CNPJ Validator — New 2026 Format

Validate CNPJs in the new alphanumeric format (IN RFB 2.119/2022, effective Jul 2026). First free online validator for the new Brazilian company ID format.

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Validate Alphanumeric CNPJ Online

Verify whether an alphanumeric CNPJ is valid using the official algorithm from Brazil's Receita Federal. Established by Instrução Normativa RFB nº 2.119/2022, the new CNPJ format allows uppercase letters (A-Z) alongside digits (0-9) in the 14-character structure, expanding the numbering capacity from 100 million to over 1.2 billion combinations.

Our validator uses the ASCII-48 standard to convert each character: digits '0'-'9' become values 0-9, and letters 'A'-'Z' become values 17-42. The two check digits are recalculated using weighted sums and modulo 97. If the computed check digits match the provided ones, the CNPJ is valid. The tool also rejects uniform sequences (e.g., AAAAAAAAAAAAA0) and inputs with incorrect length.

This validator is fully backward-compatible: you can validate both new alphanumeric CNPJs and traditional numeric-only CNPJs on this same page. The entire process runs 100% in your browser — no data is transmitted to any external server, ensuring complete privacy and LGPD compliance.

The alphanumeric CNPJ format takes effect in July 2026. All existing numeric CNPJs will remain valid indefinitely. The new format applies only to newly issued registrations after the regulation date. Systems that process CNPJs should be updated to accept alphanumeric characters before July 2026.

Need to generate test alphanumeric CNPJs? Use our Alphanumeric CNPJ Generator. For traditional CNPJs, see the CNPJ Validator and CNPJ Generator.

Frequently Asked Questions

Can I validate traditional numeric CNPJs here?
Yes. The alphanumeric algorithm is backward-compatible with numeric-only CNPJs. You can validate both formats on this page. For dedicated numeric validation, you can also use our CNPJ Validator.
When does the alphanumeric CNPJ take effect?
The alphanumeric CNPJ format, established by IN RFB 2.119/2022, will take effect in July 2026. All existing numeric CNPJs remain valid. To generate test data in the new format, use our Alphanumeric CNPJ Generator.
Is my data secure during validation?
Yes. The validation runs 100% in your browser using JavaScript. No data is sent to any server — it even works offline. You can verify this in your browser's DevTools Network tab.