Analysed entirely in your browser — the password is never uploaded or stored.
The Password Strength Checker measures how hard a password would be to guess and shows the result as a clear strength rating, an entropy figure in bits, and estimated crack times against different kinds of attackers. Type or paste a password and the meter updates instantly, along with a list of specific weaknesses and suggestions for making it stronger.
Strength here is not about whether a password "looks" complicated. It is about how many guesses an attacker would need to try before landing on it. The tool estimates that search space from the length of the password and the mix of character types, then reduces the estimate when it spots patterns that make a password predictable — common leaked passwords, keyboard runs, repeated blocks, or a single character type. That gives a more honest picture than a naive checklist of "add a symbol".
Critically, the password never leaves your device. All analysis runs in your browser in plain JavaScript, with nothing typed, pasted, or generated being uploaded, logged, or stored. That means it is safe to test real passwords, and the tool keeps working with no network connection once the page has loaded. Use it to sanity-check a password before you commit to it, or to understand why a password you thought was strong might not be.
Type or paste the password into the field. Analysis is instant and everything happens locally, so it is safe to test a password you actually use.
See the rating from Very weak to Very strong, the entropy in bits, and the estimated time to crack it for both a fast offline attacker and a throttled online one.
The tool flags specific problems such as common passwords, sequences, repeated characters, or using only one type of character.
Follow the tips — add length, mix character types, or switch to a passphrase — and watch the score improve as you refine the password.
Strength is measured in bits of entropy from length and character variety, not a superficial checklist, so the rating reflects real guessability
See how long a password would survive against both a fast offline cracking rig and a rate-limited online login attack
Common leaked passwords, sequences like "abc" or "123", keyboard runs, and repeated blocks are detected and penalized
Instead of a vague score, the tool tells you exactly what to change — add length, add a character type, or use a passphrase
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