Generador de Contraseñas — Herramienta online gratis

Free strong password generator — cryptographically secure

Herramientaolis Password Generator creates strong, random passwords using your browser's cryptographic random number generator. No server-side generation, no logging, no storage. Each password is drawn from a uniform random distribution over your chosen character pool.

What makes a password strong?

• Length — Every extra character makes brute-force attacks exponentially harder
• Character variety — Uppercase + lowercase + numbers + symbols multiply the search space
• Randomness — True randomness (not patterns, not words) prevents dictionary attacks
• Uniqueness — A different password per account limits blast radius of any single breach

Password length vs. crack time (offline attack, 1 trillion guesses/sec)

• 8 chars (letters+numbers): ~30 seconds
• 10 chars (letters+numbers+symbols): ~2 months
• 12 chars (letters+numbers+symbols): ~200 years
• 16 chars (letters+numbers+symbols): ~30 billion years
• 20 chars (letters+numbers+symbols): Heat death of the universe territory

Best practices for password security

• Use a password manager (1Password, Bitwarden, KeePass) to store unique passwords per site
• Enable 2FA on email, banking, and social accounts — better than any password alone
• Never reuse passwords between accounts — a single breach compromises all reuse sites
• Rotate high-value passwords every 12 months (email, banking, admin accounts)
• Never share passwords over email or SMS — use Signal or a shared password-manager vault