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Security & cryptography

Password strength analyser

Estimate password patterns, guesses, and ideal character entropy locally without querying breach databases.

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Using this tool

Compare common patterns and estimated guessing cost in synthetic passwords.

Actions: Analyze strength

Example

This public weak-password example contrasts pattern-aware scoring with ideal character entropy.

Example action and settings

Action: Analyze strength
Password to analyze (up to 256 characters): password

Input / action

Result / expected behavior
Characters: 8
UTF-8 bytes: 8
Estimated character pool: 26
Ideal uniform-random entropy (often an overestimate): 37.60 bits
Pattern-aware score: 0/4
Estimated guesses: 3.00e+0
Pattern-aware guessing entropy: 1.58 bits
Estimated seconds at 10,000 guesses/second: 3.00e-4
Available options: Password to analyze (up to 256 characters)
Scope and limitations
  • Input is limited to 256 UTF-16 code units; no breach database is queried.
  • Seconds assume 10,000 guesses per second and are not a guaranteed cracking prediction.
Common mistakes
  • Do not demonstrate with real passwords or equate ideal random entropy with actual password security.
Related tools
Bcrypt hash and verify  Token generator  
Privacy and browser support
Input is processed in this browser. Do not use real keys or active sensitive credentials as demonstration data. Device features require browser support and your permission.