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Password Strength & Entropy Checker

Test the cryptographic strength of your passwords against dictionary attacks, rainbow tables, and brute-force attempts. Processed 100% in your browser.

Strength Evaluation: Waiting for input... 0 bits entropy
Estimated Crack Time Instant
Character Composition None
Confidentiality Guarantee: Your password is never transmitted across the network, logged to disk, or stored in server memories. All calculations execute locally.

How Password Entropy & Strength are Measured

Password strength is mathematically defined by its information entropy, measured in bits. Entropy calculation takes into account both the length of the string and the size of the character pool (lowercase, uppercase, numbers, and special symbols).

Key Strength Benchmarks

  • Under 40 bits: Very Weak — crackable in milliseconds by commodity GPUs.
  • 40 to 60 bits: Moderate — vulnerable to targeted dictionary attacks.
  • 60 to 80 bits: Strong — resistant to offline brute-force attacks.
  • Above 80 bits: Cryptographically Secure — computationally infeasible to crack.