Generate valid RENAVAM numbers for software testing and validate any RENAVAM in your browser.
RENAVAM (Registro Nacional de Veículos Automotores) is the number that identifies a vehicle in the Brazilian national registry. It follows the car for its whole life, from the first licence plate to the transfer of ownership, and it is the key field in every DETRAN query, fine, licensing and insurance record. Since 2011 it has 11 digits: ten that identify the record plus one check digit that lets any system reject a typo before it reaches the database.
This tool does two things with that check digit. It generates random 11-digit numbers whose check digit is mathematically correct, and it recomputes the check digit of any number you paste to tell you whether it holds. The generated numbers are what you need to fill vehicle registration forms in a staging environment, to seed a fleet management database, or to write automated tests for a DETRAN integration without touching real data.
Nothing here is looked up in the DETRAN registry. A generated number is a random sequence that passes the arithmetic, not a vehicle: it has no plate, no owner and no history. That is the whole point for testing, and the reason this data must never be used to register a vehicle, contest a fine or fill any real form. The validator is just as narrow — a number can be perfectly valid mathematically and still not exist. Old 9-digit RENAVAMs are accepted too: the tool pads them with leading zeros, the way DETRAN systems do.
Check digit: reverse the first 10 digits, multiply them by the weights 2, 3, 4, 5, 6, 7, 8, 9, 2, 3 and add the products. Multiply the sum by 10 and take the remainder of the division by 11. If the remainder is 10, the check digit is 0; otherwise the check digit is the remainder itself.
No. It is a random number that only satisfies the check-digit arithmetic. It is not registered in any DETRAN database and does not correspond to any car, owner or licence plate.
Eleven digits since 2011: ten for the record plus one check digit. Numbers issued before that have nine digits and are simply padded with leading zeros, which is why this validator accepts both lengths.
On the vehicle document (CRLV, printed or digital), in the DETRAN app of your state, and on the licensing payment slip. This tool cannot look it up for you — it only checks the arithmetic of a number you already have.
No. Generation and validation run entirely in JavaScript on your device. No number is transmitted, logged or stored anywhere.
No. Using invented vehicle documents on real services may constitute fraud, which is a crime. The generator exists for software testing, QA fixtures and demos only.
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