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Password Strength Checker

Check how strong a password really is with zxcvbn-style analysis: estimated crack time, weak patterns and tips to fix it. Your password never leaves the page.

No uploads

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How to use Password Strength Checker

  1. 1Open Password Strength Checker. It runs in your browser, no sign-up.
  2. 2Type or paste your input.
  3. 3Copy or download the result.

Questions

Is my password sent anywhere?

No. The analysis runs entirely in this page with the zxcvbn-ts library. Nothing is stored, logged or transmitted.

How is strength measured?

Instead of counting character types, zxcvbn estimates how many guesses an attacker would need, spotting dictionary words, names, dates, keyboard walks, repeats and l33t substitutions.

Is a strong score enough?

A strong password can still be leaked. Use a unique password per site, a password manager and two-factor authentication, and check it with the Pwned Password Checker.

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