Legacy RENAVAM Validator (9 digits)

Old RENAVAM (9 digits) vs the modern 11-digit format

The RENAVAM (Registro Nacional de Veículos Automotores) is the number that identifies a Brazilian vehicle for its entire life — it stays the same through changes of owner, plate or state. Originally the registry issued numbers of up to 9 digits; as the national fleet grew, DENATRAN left-padded them to a fixed 11 digits, where the last digit is a mod-11 check digit. This tool recognises whether you've entered the old 9-digit form or the current 11-digit form.

If you hold an old document, the 9-digit RENAVAM is simply your 11-digit one with the leading zeros removed. To modernise it, pad on the left with zeros to 11 characters — the digits themselves don't change.

Old vs new at a glance

• Old format: up to 9 digits, printed on documents issued before the standardisation.
• New format: exactly 11 digits, the current standard everywhere (consultations, apps, Detran).
• Same number: 123456789 → 00123456789; only zero-padding differs.
• Check digit: the final digit is a mod-11 verifier — a full validator should compute it, not just count digits.

Where it matters

• Legacy paperwork: older CRV/CRLV documents show the 9-digit form; modern systems expect 11.
• Lookups: IPVA, licensing, fines and transfer all query by the 11-digit RENAVAM.
• Data migration: importing old records means normalising every RENAVAM to 11 digits.
• Mock data / testing: handling both lengths gracefully in form validation.

Common pitfalls

• Don't store as an integer: that drops the leading zeros and breaks the 11-digit form and its check digit.
• Pad, don't recompute: converting 9 → 11 is pure left-zero-padding; the value is unchanged.
• Length ≠ valid: this page checks digit count; the real RENAVAM must also pass its mod-11 check digit.
• RENAVAM ≠ plate ≠ chassis: three different identifiers — the RENAVAM is the registry key, the VIN/chassis is the manufacturer's.

FAQ

Is my old 9-digit RENAVAM still valid? Yes — it's the same number; just pad it to 11 digits with leading zeros for modern systems.

How do I convert 9 digits to 11? Add leading zeros until it's 11 characters long; nothing else changes.

Does the RENAVAM have a check digit? Yes — the last of the 11 digits is a mod-11 verifier; count alone isn't full validation.