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Password Strength Checker

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Free password strength checker with local composition heuristics and a random-model bit estimate - nothing is uploaded.

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Composition heuristic only. The random-model search space assumes independent random characters; it does not measure the entropy or crack time of your password.

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Enter a password to see suggestions

Local composition and pattern heuristics plus a random-model bit upper bound. Does not predict crack time or check breach databases - pair with Password Generator for creating new secrets.

See more about the Password Strength Checker

Examples

Review a passphrase

Example: correct horse battery staple → score + composition notes + random-model bits

Random-model bits assume independent random characters. They are not measured entropy of your real password.

Need a new password?

Use Password Generator, then paste the candidate here to review composition heuristics

This page does not predict crack time or query breach databases.

Key features

  • Composition heuristics
  • Random-model bit estimate
  • Local-only checks

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Quick answers for Password Strength Checker

What do the score and random-model bits mean?
The score uses composition and obvious-pattern heuristics. Random-model bits are a theoretical upper bound assuming independently sampled characters, not measured password entropy.
Does it predict crack time or check breaches?
No. It does not predict an attacker’s cracking time or query breach databases.
Is my password uploaded?
No. These checks run locally on the characters you enter. Show/Hide changes only the input’s masking.