Free Password Strength Checker

A password strength checker estimates how hard a password would be for an attacker to guess. People also call it a password checker, a password strength tester, or a password security checker. The goal is the same: give you a quick, honest read on whether a password is predictable before you rely on it.

This password checker uses zxcvbn-ts, a maintained, pattern-aware estimator. Instead of counting character types, it looks for the shortcuts a guessing attack would take, such as dictionary words, common passwords, keyboard walks, repeats, and substitutions like @ for a. The result is an estimate, not a guarantee.

To measure password strength, consider both length and predictability. Length matters because every extra character multiplies the number of possibilities an attacker has to consider, but only if those characters are unpredictable. A long password built from one repeated word is still easy to guess.

Predictability is the heart of the estimate. The checker matches your password against dictionaries of common passwords, names, and words, then looks for repeated characters, sequences such as abcd or 1234, keyboard patterns such as qwerty, and common substitutions. Each matched fragment is cheap to guess, so the more of the password it explains, the lower the score.

Character diversity and uniqueness play supporting roles. Mixing character types can widen the search space, which is why this page shows which types are present, but it is shown as a description only. Uniqueness is something no checker can see: a strong password reused on two services is only as safe as the weaker service.

Many people want a password complexity checker that confirms an uppercase letter, a number, and a symbol. Those rules are easy to satisfy and easy to predict. Summer2024! has every category and is still a pattern attackers try early.

Length and unpredictability are generally more meaningful than composition rules. A passphrase of several unrelated words is usually both longer and easier to remember than a short, dense string. That is why the character mix on this page is informational and never a pass or fail requirement, and why the suggestions favor more length over more symbols.

A strong password is long, unique to one account, and not built from personal details, common words in a predictable order, or a pattern you reuse with small changes. For people-typed secrets, a passphrase of four to six random, unrelated words is a good approach. For accounts managed by a password manager, a long random string is better because nobody has to remember it.

A strong password checker is a useful starting point, but account protection needs more than a score. Pair the password with multi-factor authentication wherever the service supports it. A strong password lowers the chance of being guessed; MFA limits the damage if it is stolen another way. This tool does not generate or save passwords. If you need a random one, use a generator you trust and store the result in an approved manager.

Before running a password test, avoid typing a real, in-use password into any website at all. Many people instead test a similar one that follows the same habits, and that is a sensible precaution.

This ITDock tool performs the test locally in the browser. The analysis library loads with the page, the password is held only in page memory while you type, and no request is made when you type or test. The field is hidden by default, has autocomplete disabled, and is cleared when you press Clear, leave the page, or come back to it from the browser history. You can confirm this yourself by watching the network tab in your browser's developer tools while you type.

These are different questions. Password strength estimates how difficult a password may be to guess. Password breach checking determines whether a password has appeared in known breach datasets.

This page does strength estimation only. It does not check whether a password has been leaked, and it makes no network lookups to find out. A password can look strong here and still be exposed if it was reused or captured elsewhere, so use a dedicated breach-monitoring service or your identity provider's compromised-password protection for that.

The guess estimate shown in the results is the number of guesses the model thinks a smart attacker would need under its own assumptions, shown with the equivalent in bits. It is useful for comparing passwords, not for predicting real attacks.

A password safety checker cannot protect against phishing, malware, or someone seeing your screen. Real resistance depends on how the password is stored, the attacker's hardware, rate limiting, and whether the password is already known. That is why this tool does not show a time-to-crack figure. Treat the score as guidance and never as proof of safety.

For an MSP, passwords are an operational risk across many clients. Each client should have unique credentials, administrative and privileged accounts deserve the longest and most carefully managed secrets, and shared accounts should be removed or tightly documented, because nobody can say who used them.

Good credential hygiene also means knowing where every credential lives, who can see it, and when it was last rotated. Spreadsheets and chat messages fail that test. ITDock helps MSPs organize client credentials, devices, networks, and technical documentation in one place, so strong passwords are stored securely and the next technician knows what each one protects.