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Password Strength Checker

Review whether a password is long, unique, and hard to guess. See clear warnings, improvement tips, and a local-only safety report.

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The password is analyzed only in your browser. Do not paste real passwords on shared or untrusted devices.

Password to review

Use this before saving a new password. Add optional context words to catch names, brands, or dates that attackers might guess.

Local review only

This checker can spot obvious risks, but it cannot know whether a password has appeared in a breach. Use a password manager and enable multi-factor authentication.

How password strength is reviewed

The checker estimates entropy from length and character pool, then subtracts risk for common passwords, personal context words, repeated blocks, sequences, and keyboard patterns.

Usage notes

  • Estimated entropy = length x log2(character pool)
  • Risk penalties apply for common words, repetition, sequences, and context words
  • Long unique passwords are favored over arbitrary complexity rules

Frequently asked questions

Does this page send my password anywhere?expand_more

No. The analysis runs locally in your browser.

Why does a long passphrase score well?expand_more

Length makes guessing harder, especially when the phrase is not a famous quote or reused text.

Is a strong score enough?expand_more

No. Use a unique password per account and enable multi-factor authentication where possible.

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