Free utility tool
Password Strength Checker
Test your password — see its strength score, entropy and estimated time to crack.
Runs 100% in your browser. Your data is never sent anywhere.
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Why use this tool
A strong password is long, varied and unique. This tool scores your password by length, character variety and estimated entropy, then estimates how long an offline attacker would need to crack it.
Everything is computed locally — your password never leaves your browser.
Features
Live strength score (weak → strong)
Entropy measured in bits
Estimated time to crack
Checklist with improvement tips
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How it works
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1
Type your password
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2
Watch the score update
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3
Apply the tips to strengthen it
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Frequently asked questions
Is my password sent anywhere?
No. The strength check runs entirely in your browser; nothing is transmitted.
What makes a password strong?
Length matters most: 12+ characters, mixing upper, lower, digits and symbols, and never reusing it elsewhere.
What is entropy?
A measure of unpredictability in bits. Higher entropy means more guesses are needed to crack the password.