Password & Keys
Password Entropy Calculator
Estimate how resistant a password might be to brute-force guessing by looking at its entropy and approximate crack times.
All processing happens in your browser. This is a rough model for educational use, not a guarantee of security.
Input
Longer, more random passwords with a bigger character set have higher entropy.
Offline fast: 10¹⁰ guesses/sec. Online throttled: 10⁴ guesses/sec.
Entropy is estimated from password length and detected character sets (lowercase, uppercase, digits, symbols). Actual security also depends on reuse, storage, and attacker knowledge.
Results
Use this as a rough sense-check of password strength, not an excuse to skip MFA.
Length: —
Estimated character set size:
—
Entropy:
— bits
Rating: —
Offline fast (10¹⁰ guesses/sec):
—
Online throttled (10⁴ guesses/sec):
—