Password Entropy Meter

Measure password strength in bits of entropy — charset analysis plus crack-time estimates.

Password: Show password

—Entropy (bits)

—Rating

Analysis appears here…

Checked locally — your password never leaves this browser.

How to use

Type a password to see its entropy in bits, strength rating and estimated crack time.

What is entropy?

Bits of randomness: length x log2(character set size). 80+ bits is strong; under 40 is weak.

Is my password sent anywhere?

No — everything is computed locally in your browser. Nothing is stored or sent.

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