Password Strength Checker
Check whether an existing password holds up against modern security guidance — entropy, character diversity, and predictable-pattern detection. Runs entirely in your browser; nothing is transmitted or stored.
This check runs entirely in your browser using the Web Crypto-backed analysis engine that also powers the Password Generator. Nothing you type here is transmitted, logged, or stored — not even temporarily.
FAQ
Common Questions
Is it safe to type my real password into this tool?
The analysis runs entirely in your browser using client-side JavaScript. Nothing you type is transmitted to a server, logged, or stored at any point — not even temporarily. That said, as a general practice, avoid entering a password you are not planning to change soon into any online tool, including this one.
What counts as a "strong" password?
This tool scores strength primarily on length and entropy, and penalizes repeated characters, sequential patterns (like "1234"), and dictionary-adjacent words. A password scoring "Strong" or "Excellent" with at least 12-16 characters and no flagged patterns aligns with current NIST, Microsoft, HIPAA, and PCI DSS guidance. Like all client-side strength meters, this is a heuristic estimate, not a rigorous cryptographic entropy measurement — see Understanding Password Entropy for what a true entropy calculation requires and why appearance-based scoring has real limits.
Why did a password with numbers and symbols still score poorly?
Character variety alone does not guarantee strength. A password like "P@ssw0rd1!" contains every character class but follows predictable substitution patterns that automated cracking tools test first. Length and genuine unpredictability matter far more than checking every character-type box — see NIST Password Guidelines for the full explanation.
Should I fix a weak password or generate a new one?
In most cases, generating a new, fully random password or passphrase is faster and more reliable than trying to strengthen an existing one. Use the Password Generator to create a strong replacement, then store it in a password manager rather than trying to remember a modified version of the old one.
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