Password Strength Checker

The Password Strength Checker shows a live strength meter, entropy in bits, an estimated crack time, and any weak patterns it spots as you type. It is for anyone wanting to judge a password before relying on it, with nothing typed ever leaving the browser.

A password can look complex yet be weak because of a predictable pattern. Checking it locally gives an honest estimate of its real strength without ever transmitting what you type.

1. Type the password you want to assess.
2. Watch the strength meter and entropy estimate update live.
3. Read the estimated crack time as a rough guide to resilience.
4. Note any weak patterns the checker highlights.
5. Strengthen the password and re-check until it holds up.

• Live strength meter and entropy in bits
• Estimated crack-time guidance
• Weak-pattern detection
• Nothing typed leaves the browser

• Sanity-checking a password before using it on an account
• Comparing two candidate passwords for strength
• Teaching why length matters more than symbol swaps
• Spotting predictable patterns in an existing password

• Favour length; a longer passphrase usually beats a short string packed with symbols.
• Treat the crack-time figure as indicative only, since it depends on assumed attacker speed.
• Use a unique password per account and store them in a password manager.

• Trusting a password that looks complex but follows a common pattern; the checker flags those.
• Relying on character substitutions like “@” for “a”, which attackers anticipate.
• Treating the crack-time estimate as a guarantee rather than a rough, assumption-based figure.