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Password Strength Checker — Real Entropy & Crack-Time Estimate

Most strength meters just count character classes. This one computes real entropy and estimates how long the password survives against different attack speeds — the specific weaknesses attackers actually exploit, like dictionary words and predictable substitutions — entirely in your browser. An optional AI pass suggests memorable passphrase alternatives.

How to use AI Password Strength Analyzer

  1. Type your password (it is never sent anywhere for the local check).
  2. Read the entropy score and estimated crack time.
  3. See which specific weaknesses were detected.
  4. Optionally get AI-generated memorable passphrase alternatives.

Frequently asked questions

Is my password sent to a server?
The strength analysis runs entirely in your browser. Only if you request AI passphrase suggestions is a prompt sent to the AI provider — your actual password is not included in that request.
Why did a long password still score as weak?
Length alone is not enough — a long but predictable pattern (like a keyboard walk or a common phrase) has far less real entropy than its character count suggests.
What is crack time actually estimating?
How long a brute-force or dictionary attack would take at a given guesses-per-second rate — a way to make entropy concrete rather than abstract.

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