Password strength analyzer
Estimates entropy from character variety and length — a rough guide, not a guarantee. It doesn't check against real-world leaked password lists. Runs entirely in your browser; nothing is sent anywhere.
Rating
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Entropy
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Character pool
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Est. time to crack (offline, fast hash)
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What is Password strength analyzer?
Password strength is really a measure of entropy — how many attempts, on average, it would take to guess it — which depends on length and character variety far more than most people assume.
How to use it
Type a password to see its estimated entropy in bits, a rough offline-cracking time estimate, and plain-language notes on what would make it stronger. It doesn't check against real-world leaked password lists, so treat it as a rough guide.
Example
"password123" -> weak, cracked in seconds
"K7#mZq2$vLpN9!xRtWc4" -> very strong, would take centuries