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Verificador de Fortaleza de Contraseña

Verificador de fortaleza de contraseña gratuito. Estima la entropía y la fortaleza localmente — nunca se envía por la red — con consejos prácticos para mejorar tu contraseña.

Runs in your browser
Input
Tested on your device. Nothing is sent or saved.
Need a strong one? Generate a new password
Output
StrengthEmpty
0 characters0 bits

Type a password above to see what it has and what it's missing.

Nota del editor

Understanding · Entropy beats cleverness.

Este capítulo en profundidad está disponible solo en inglés por el momento. La herramienta de conversión de arriba funciona en tu idioma; el artículo explicativo extenso aún no se ha traducido.

Preguntas frecuentes

Quick answers.

Is my password sent anywhere?

No — strength estimation runs entirely in your browser. Nothing is logged.

What does entropy mean?

Bits of randomness — roughly, how many guesses an attacker would need. 50 bits is okay; 80+ is strong; 128+ is excellent.

Why does 'P@ssw0rd!' get a low score?

Common substitutions (a→@, o→0) are the first thing password crackers try. The pattern 'capital + word + symbol + digit' adds very little real strength.

Is a long passphrase better than a short complex one?

Usually yes. 'correct horse battery staple' is much stronger than 'P@ssw0rd!' — length wins over complexity.

Is the checker free?

Yes — fully free, no signup.

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