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This password strength checker rates how hard your password would be to crack and points out the weaknesses that make accounts easy to break into. Type or paste a password and it estimates strength based on length, character variety and predictability — all in your browser. It is handy for anyone setting up a new login, tidying up a password manager or teaching good security habits.
The checker scores a password on the factors that matter most to attackers: total length, the mix of lowercase, uppercase, numbers and symbols, and whether it relies on common words or obvious patterns. Longer passwords with a wide character set produce far more possible combinations, which is what makes brute-force guessing impractical.
Each extra character roughly multiplies the number of guesses an attacker must try, so length usually beats complexity. The tool combines these signals into a single rating from weak to strong and flags issues such as short length or dictionary words so you know exactly what to fix.
Strength is estimated from length, the variety of character types you use, and how predictable the password is. Longer passwords that avoid common words and simple patterns generate exponentially more possible combinations, which is what makes them resistant to guessing.
No. The check runs entirely in your browser using JavaScript, so your password is never transmitted, logged or stored. You can even disconnect from the internet and it will still work.
Length is the single biggest factor, followed by using a mix of character types and avoiding dictionary words, names and keyboard patterns. A random passphrase of several unrelated words, or 16 or more mixed characters, gives you a strong, memorable result.
Modern guidance favors long, unique passwords over frequent forced changes. Change a password promptly if it may have been exposed in a breach or reused elsewhere, and use a password manager so every account can have its own strong password.