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Password Strength Checker

Test how strong your password is and see how long it would take to crack. Everything runs in your browser — your password never leaves your device.

Strength: —

Estimated time to crack: —

🔒 Your password is checked locally and never sent anywhere.

How this password strength checker works

As you type, the checker estimates your password's entropy — a measure of randomness in bits — from its length and the mix of character types (uppercase, lowercase, numbers, symbols). It then converts that into an estimated time to crack by brute force. The longer and more varied your password, the higher the entropy and the longer it would take an attacker to guess.

Brute force alone flatters predictable passwords, so the checker also looks for patterns a real attacker would exploit first: common base words, keyboard sequences such as qwerty or 12345, repeated characters, and the mangling rules cracking tools apply to every dictionary word — capitalising the first letter, substituting @ for a or 0 for o, and tacking numbers or symbols on the end. That's why P@ssw0rd123! scores far worse than its length and character mix suggest.

How to make your password stronger

  1. Make it longer. Length beats complexity — aim for 16+ characters.
  2. Mix character types. Combine uppercase, lowercase, numbers, and symbols.
  3. Keep it random. Avoid names, dates, and keyboard patterns. Generate one with our free password generator.
  4. Never reuse it. Give every account its own password and store them in a manager.

Is it safe to check my password here?

Yes. This tool runs entirely in your browser — nothing is transmitted, logged, or stored. If you'd rather not type a real password anywhere, test a close variation instead. Learn more about how secure your password really is and how to create strong passwords.

Keep every password strong with TeamPassword

A checker tells you where you stand; a password manager keeps you there. TeamPassword lets your whole team generate, store, and share strong, unique passwords securely. See pricing or compare TeamPassword to other password managers.

Frequently asked questions

Is it safe to check my password here?
Yes. The checker runs entirely in your browser — your password is never sent to our servers, logged, or stored. For total peace of mind, test a variation rather than your exact password.
How is password strength measured?
We estimate entropy — a measure of randomness in bits — from the length and mix of character types, then translate it into an estimated time to crack. We also check for guessable patterns: common base words, keyboard runs like qwerty, repeats, and the standard mangling rules attackers apply (capitalising the first letter, swapping a for @, adding numbers on the end). When a pattern is found, we report the cheaper of the two estimates, because that is the route an attacker would take.
Why is “P@ssw0rd123!” rated weak when it looks complex?
Because it is still the word password. Cracking tools run dictionaries of common passwords through mangling rules — capitalisation, character substitutions, appended digits and symbols — so a decorated dictionary word falls in seconds. A short random password is far stronger than a long predictable one.
What is a good password strength?
Aim for a password that would take centuries to crack — generally 16+ characters mixing uppercase, lowercase, numbers, and symbols. Length is the single biggest factor.
Does a strong password mean my account is safe?
A strong, unique password is essential but not the whole story. Never reuse passwords, turn on two-factor authentication, and store everything in a password manager like TeamPassword.

Stop reusing weak passwords

Generate, store, and share strong passwords across your team with TeamPassword.

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