Password Strength Checker — private, on-device

Entropy math + pattern detection + honest crack-time ranges. Your password never leaves this page — verify it in your network tab.

Quick answer: Check any password's real strength: entropy bits, crack-time estimates, and breach-pattern detection (common passwords, keyboard walks, repeats) — computed entirely on your device. Nothing is ever sent anywhere.

–Entropy bits

–Offline crack @10B/s

How to use

Type or paste a password — watch the meter and the pattern flags.

About this tool

Strength = entropy: length × log2(alphabet size), minus penalties when patterns (dictionary words, '123456', keyboard rows like 'qwerty', doubled chunks) let attackers skip most guesses. This tool computes bits, translates to offline-crack time at 10 billion guesses/second (modern GPU rig), and flags the specific pattern that weakens you — all locally, so even this page never sees your secret.

FAQ

Is it safe to type my password here?

Safer than any online checker: the analysis is pure local JavaScript and no network request contains your input. Still, prefer testing a similar-but-not-identical password.

What's a good score?

60+ bits (≈12+ random chars or 5 random words) resists offline GPU cracking for centuries.

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Password Strength Checker — private, on-device

How to use

About this tool

FAQ

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