RENAVAM Validator (vehicle registration)

About this tool

RENAVAM (Registro Nacional de Veículos Automotores) uses a single national mod-11 algorithm: 10 base digits weighted by 3,2,9,8,7,6,5,4,3,2 with one check digit. Since 2013 it is standardized at 11 digits; older 9-digit codes are zero-padded to 11 before checking. Technical validation only.

How it works

1. Paste a RENAVAM (11 digits; legacy 9-digit codes are zero-padded).
2. The validator recomputes the national mod-11 check digit.
3. Read the result locally in your browser — nothing is uploaded.

Example output

{
  "valid": true,
  "reason": "Valid RENAVAM.",
  "Formatted": "9876543210-3"
}

Frequently asked questions

Does a valid RENAVAM mean the vehicle is registered?

No. This only checks the format and mod-11 check digit — not whether a vehicle record exists.

Does it accept old 9-digit codes?

Yes — legacy 9-digit RENAVAMs are zero-padded to the current 11-digit standard before the check.

Does it run locally?

Yes — validation happens entirely in your browser; the number is never uploaded.

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