🔐 Generador de Contraseñas Fuertes Gratis

Generate strong, random passwords instantly. Customize length (up to 128 chars), character sets. Uses Web Crypto API. 100% free, no signup, no server.

Generate passwords up to 128 characters with any combination of uppercase, lowercase, numbers, and symbols. Passwords are generated using your browser's Web Crypto API — they never touch a server. No account required, completely free.

Password Length

Character Types

Uppercase A–Z Lowercase a–z Numbers 0–9 Symbols !@#$%^&*

Exclude similar (I,l,1,O,0,|)

Count:

How to Use

Configure options

Set your desired length with the slider and choose which character types to include.

Click Generate

Press Generate (or adjust any option) to instantly create cryptographically secure passwords.

Copy and use

Click the copy button next to any password. Use Copy All to copy multiple passwords at once.

Frequently Asked Questions

Are the generated passwords stored anywhere? +

No. Passwords are generated using your browser's built-in cryptographic random number generator (crypto.getRandomValues) and never leave your device.

How strong is a 16-character password with all character types? +

A 16-character password using uppercase, lowercase, numbers, and symbols has approximately 95^16 ≈ 4.4 × 10^31 possible combinations — effectively impossible to brute force with current technology.

What makes a password secure? +

Length (16+ characters), variety (uppercase, lowercase, numbers, symbols), uniqueness (never reuse), and randomness (not based on words or patterns).

Why exclude similar characters like I, l, 1, O, 0? +

These characters look identical in many fonts and can cause confusion when copying passwords manually. Excluding them prevents copy errors without significantly reducing security.

How many characters should my password have? +

Security experts recommend at least 16 characters for most accounts. For critical accounts (banking, email), use 20+ characters. Our generator supports up to 128 characters.

Guía: Generador de Contraseñas Seguras

¿Qué es?

Este generador usa crypto.getRandomValues() del navegador para producir contraseñas verdaderamente aleatorias con alta entropía. Los humanos somos malos creando aleatoriedad — tendemos a patrones predecibles.

Una contraseña de 16 caracteres con todos los conjuntos tiene ~105 bits de entropía — miles de millones de años para fuerza bruta.

Cómo usar

Ajusta la longitud — 16+ para cuentas importantes, 20+ para críticas.
Selecciona los conjuntos: mayúsculas, minúsculas, números, símbolos.
Haz clic en Generar para una nueva contraseña aleatoria.
Guarda inmediatamente en un gestor de contraseñas.

Consejos

Nunca reutilices contraseñas — usa un gestor como Bitwarden o 1Password.
Para contraseñas memorables, considera frases de 4+ palabras aleatorias (diceware).
Activa 2FA siempre que sea posible, independientemente de la fortaleza.