Free tools · Security
Password strength and entropy checker
A pattern-aware estimate: it catches leet substitutions, appended digits, keyboard walks and known words, then shows how long online and offline attacks would need. The value stays in this tab.
Check a password
Nothing leaves the pageType a password to see the estimate.
Practice this in the app
Free to start. No card.
Questions
It estimates the size of the search space for a randomly generated password: length multiplied by the log base 2 of the character pool. A longer password from a larger pool has more entropy. It is a property of the generator, not proof that a particular password is safe.
Password rules are a control, not a guarantee
Security+ asks you to choose controls that fit the threat. SecLern scenarios put password policy, MFA and account lockout side by side.
Free tier, no card. Pro starts with a 7-day trial; a card is required and you can cancel before day 7.