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Password Strength Checker

How long would your password survive a real attack? Find out — without it ever leaving your browser.

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🔒 100% offline check — your password is analyzed in your browser and never sent anywhere

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What makes a password strong?

Two things: length and unpredictability. Every extra character multiplies the work an attacker must do, and mixing cases, numbers and symbols multiplies it further — that's the entropy score you see in bits. But raw math isn't enough: attackers try common passwords, keyboard runs like qwerty, years and repeated characters first, so this checker hunts those patterns and slashes the score accordingly. A password that would take "centuries" by brute force falls in seconds if it's on the common list. Aim for 12+ characters, all four character types, and no dictionary words — or better, generate one with our Password Generator.

FAQ

Is it safe to type my real password here?
The analysis runs entirely in your browser — nothing is sent, stored or logged, and the page makes no network requests with your input. That said, the universal safety habit is to test a similar-style password rather than the exact one you use for banking.
What do the crack-time numbers mean?
Two attack scenarios: an online attack throttled to ~100 guesses per second (like trying a login form), and an offline attack at 10 billion guesses per second (a stolen password database attacked with modern GPUs). Offline is the scary one — that's why length matters so much.
Why did my long password score "Very weak"?
Because it matches a known pattern — a common password, keyboard sequence or repeated characters. Attackers try patterns before brute force, so pattern-matching passwords fall almost instantly regardless of length.

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