Password Strength
Analyze password entropy, length, and character variety
About Password Strength
Scores a password as you type and shows a five-level strength bar from Very weak to Very strong, a six-point checklist, the character count and an estimated entropy in bits. A show/hide toggle lets you review what you entered. Useful for explaining password policies or sanity-checking generated passwords, though a high score is not proof that a password is safe.
Category: Generators.
Frequently asked questions
What factors determine password strength?
▾
This meter awards points for lowercase, uppercase, digits and symbols, for no character repeated three or more times in a row, and for reaching 8, 12 and 16 characters; the total sets the label. It does not check dictionary words, keyboard patterns or breached-password lists, which are what real attackers try first.
What is entropy in password strength?
▾
Entropy estimates unpredictability in bits. Here it is length × log2(pool size), where the pool adds 26 for lowercase, 26 for uppercase, 10 for digits and 32 for symbols, assuming every character was picked at random. Human-chosen passwords are far less random, so treat the number as an upper bound.
Why can a weak password like P@ssw0rd still score Very strong?
▾
The label reflects only character variety and length, so P@ssw0rd and Password1! reach Very strong even though attackers try them early, while a 25-letter lowercase passphrase such as correcthorsebatterystaple gets only Fair. Prefer long random passwords from a generator over clever variations of a word.
Is my password sent to a server?
▾
No. Strength analysis runs entirely in your browser. Your password never leaves your device.