Brazilian Voter ID Generator

What is a Voter ID generator used for?

The Brazilian Voter ID (Título de Eleitor) runs to 12 digits. Eight make up the sequential number, two point to the state via the TSE code, and the final two are check digits. For São Paulo and Minas Gerais the algorithm changes a bit.

It comes in handy when you need to test voter registration systems, voting forms and TSE APIs in a development environment.

For testing and development use only.

Anatomy of the Brazilian voter registration number

The Título de Eleitor is the political identity document every Brazilian citizen receives when registering with the electoral authority. It is issued by the Tribunal Superior Eleitoral (TSE) through the regional electoral courts (TREs), tracks where the voter is enrolled and which polling section they belong to, and has been the legal foundation of voting in Brazil since the Código Eleitoral (Lei 4.737/1965). Modern enrolment is biometric: a fingerprint scan and a photograph are recorded so the elector can be identified even without the physical card. Voting is compulsory for citizens aged 18 to 70 and optional for those between 16 and 17 or above 70.

The number has twelve digits arranged in three blocks. The first eight digits are the elector's sequential identifier inside their state. The next two digits encode the federative unit (UF) where the title was originally issued — they do not change if the voter later transfers their domicile. The last two digits are check digits computed with the modulo-11 algorithm; together they protect the rest of the number from typos in voting-machine and self-service input.

UF codes used in the 9th and 10th positions

The two-digit UF block follows the TSE's own table, not the IBGE codes used elsewhere: SP=01, MG=02, RJ=03, RS=04, BA=05, PR=06, CE=07, PE=08, SC=09, GO=10, MA=11, PB=12, PA=13, ES=14, PI=15, RN=16, AL=17, MT=18, MS=19, DF=20, SE=21, AM=22, RO=23, AC=24, AP=25, RR=26, TO=27, and 28 for citizens registered abroad (the so-called zona eleitoral do exterior, with consular polling sections).

Check-digit math (modulo 11)

First DV. Take the eight identifying digits and multiply each by the weights 2, 3, 4, 5, 6, 7, 8, 9 in order. Sum the products and take the remainder modulo 11. If the remainder is 10, the DV is 0. There is a famous exception: if the remainder is 0 and the UF is São Paulo (01) or Minas Gerais (02), the DV is forced to 1 — a quirk inherited from the original federal-revenue-style modulo-11 routine adapted by the TSE. Otherwise the DV equals the remainder.

Second DV. Take the two UF digits followed by the first DV (three digits in total) and multiply by the weights 7, 8, 9. Sum, modulo 11, and apply the same special rules: 10 becomes 0, and remainder 0 in SP/MG becomes 1. The result is the second check digit.