Gerador de Senhas — Calculadora Online Grátis
Secure passwords with entropy bits, strength rating & crack time
The Password Generator creates strong, random passwords built from your choice of uppercase letters, lowercase letters, numbers, and symbols — and shows you the entropy in bits, strength rating, and estimated crack time for each result. It's built for anyone who wants passwords they can trust without a security degree.
Frequently Asked Questions
Sobre Esta Calculadora
Weak passwords are the most common entry point for account breaches — dictionary attacks and credential stuffing tools can tear through millions of guesses per second. The safest passwords are long, random, and unique to each account.
This generator uses cryptographic randomness (not a predictable algorithm) to build passwords from whichever character sets you enable. The entropy readout shows the mathematical strength of your password: anything above 80 bits is considered strong; above 128 bits is effectively uncrackable with current technology. The estimated crack time gives you an intuitive sense of what that means in practice.
Generated passwords are never transmitted or stored — everything happens in your browser. Pair this with a password manager to store and use strong unique passwords across all your accounts.
O Gerador de Senhas cria senhas fortes e aleatórias a partir de sua escolha de letras e números.
Exemplo Resolvido
Generating a 16-character password with all character types
Entradas:
- Length: 16 characters
- Uppercase: Yes (26 chars)
- Lowercase: Yes (26 chars)
- Numbers: Yes (10 chars)
- Symbols: Yes (32 chars)
Passo a Passo:
- Total character pool: 26 + 26 + 10 + 32 = 94 characters
- Entropy = Length × log₂(Pool size) = 16 × log₂(94) = 16 × 6.55 = 104.8 bits
- At 10¹² guesses/second (modern GPU attack), cracking time ≈ 2⁹² seconds ≈ trillions of years
- Strength rating: Very Strong