Use this password-strength estimate to identify obvious weaknesses and compare candidate length and composition without transmitting the secret elsewhere.

Password

Password characters to assess.

Estimate offline-attack strength from character-class pool size and length, never storing or transmitting the secret. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Strength band

Offline-attack resistance classification.

Entropy (bits)

Estimated entropy in bits.

Pool size

Detected character-class pool size.

Length

Password length in characters.

• Composition scores cannot reliably predict cracking cost because common phrases, reuse, patterns, leaks, attacker models, hashing, and rate limits dominate. A high score does not prove a password is uncompromised.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Use a password manager to generate unique long passwords, enable phishing-resistant multifactor authentication, and check breach exposure with a privacy-preserving service.

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