Analyze password strength and get security recommendations. Fast, secure, and completely free. All processing happens in your browser — no data is sent to any server.
A Password Strength Checker evaluates a candidate password against multiple real-world weakness patterns — not just length and character variety, but also dictionary words, keyboard patterns (qwerty, 12345), common substitutions (p@ssw0rd), and repeated sequences — using an approach similar to the widely-used zxcvbn algorithm rather than a naive character-class checklist. Simple rule-based checkers (require one uppercase, one number, one symbol) can rate 'Password1!' as strong even though it's one of the first passwords an attacker would try; a pattern-aware checker recognizes why that password is actually weak.
Most real-world password breaches come from weak, guessable passwords, not sophisticated cryptographic attacks — which means the actual risk isn't measured by 'does it have a symbol' but by 'how quickly would a targeted or dictionary-based attack guess it.' Checking a password before you rely on it for anything sensitive — a new account, a shared team credential, a password manager's master password — helps you catch a weak choice before it becomes the entry point for an account compromise.
No — the check runs entirely in your browser's JavaScript, with no network request. Nothing you type is ever transmitted or stored.
Meeting basic character-class rules doesn't protect against dictionary attacks — a common word with predictable substitutions (like P@ssw0rd1) is still one of the first patterns attackers try, regardless of technically satisfying complexity requirements.
Length combined with genuine unpredictability matters most — a long, random passphrase or a password generated by a trustworthy tool beats a short password with forced complexity rules almost every time.
Treat it as a relative indicator rather than a precise guarantee — actual crack time depends heavily on the specific attack method, hashing algorithm used to store the password, and available computing resources.
No — strength and reuse are separate risks. Even a strong password should never be reused across multiple accounts, since a breach on one site can expose it for use elsewhere.