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Password Strength Checker
Measure how strong a password is: it estimates entropy in bits, an offline time-to-crack, and checks length and character variety — all in your browser, so the password is never sent anywhere.
—0 bits of entropy
Estimated time to crack (offline)
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- ○ At least 12 characters
- ○ Upper & lowercase letters
- ○ At least one number
- ○ At least one symbol
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
Is my password sent anywhere?＋
No — it's analysed entirely in your browser and is never transmitted or stored.
How is the strength estimated?＋
From entropy — the character variety (pool size) and length — plus an estimated offline time-to-crack. It's a guide, not a guarantee.
What makes a password strong?＋
Length matters most. A long passphrase with mixed character types is far harder to crack than a short complex one.