Security
Password Entropy Calculator
Analyze password charset and calculate entropy bits from detected character types.
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Frequently Asked Questions
Quick answers to common questions
What is password entropy?+
Entropy = length × log₂(charset size). It estimates how many bits of randomness a password has.
How many bits do I need?+
80+ bits is reasonable for most accounts. 128+ bits is excellent.
How is charset detected?+
We inspect your password for lowercase, uppercase, digits, and symbols, then sum the pool sizes of each type present.
Is this stored?+
No. All calculations run in your browser.