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Password strength meters estimate how guessable a password may be; their crack-time figures are conditional scenarios, not guarantees. Treat a checker as feedback, then protect accounts with long, unique passwords, a password manager, and stronger sign-in options where available.
How strong is my password?
A password checker generally analyzes patterns that make a password easier to guess, such as common words, repeated characters, dates, sequences, keyboard patterns, and predictable substitutions. Some estimators use those patterns and common-password data to estimate how many guesses an attacker might need.
That estimate is not a precise measure of a person-created password’s security. NIST says that “estimating entropy for user-chosen passwords is challenging.” Length is a primary factor in strength; NIST’s guidance on creating a good password says, “The most important part of a good password is its length.” NIST SP 800-63B discusses memorized-secret strength in the context of its digital identity standard.
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How long would it take to crack my password?
A crack-time display converts an estimated number of guesses into a time using an assumed attack rate. The time depends on the attack method, the password storage method and its work factor, rate limits, and the attacker’s computing resources. Without those assumptions, a figure such as “centuries” is not meaningful.
Dropbox’s zxcvbn documentation presents its outputs as back-of-the-envelope estimates for distinct scenarios, including throttled online attacks, unthrottled online attacks, and offline attacks against slow or fast password hashes. A service that limits login attempts changes the online scenario; an attacker with stolen password hashes faces a different one. Dropbox zxcvbn documentation
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These are modeled scenarios, not measured results for your password or a promise about how long a real attack would take. A checker’s displayed time should be read as an illustration of its assumptions, not as a countdown to safety.
Are password strength checkers accurate?
They can provide useful feedback about guessability, especially when they identify a common password or a predictable pattern. They cannot establish with certainty how resistant a password is to every possible attack. There is no current head-to-head accuracy figure established here for consumer password estimators, so a percentage claim about how accurate a particular meter is would be misleading.
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The 2016 USENIX Security paper on zxcvbn is a foundational evaluation of that estimator, not a current comparative benchmark for all password checkers. USENIX Security 2016: zxcvbn paper
A high score also does not tell you whether a password has been reused or exposed in a breach, whether you are entering it on a phishing site, or whether malware is capturing keystrokes. Password length and complexity cannot prevent every account attack. OWASP recommends controls such as blocking common and previously breached passwords, alongside other authentication protections. OWASP Authentication Cheat Sheet
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Why do password checkers give different results?
They may use different pattern dictionaries, guessing models, attack rates, and assumptions about online throttling or password hashes. One checker may recognize a keyboard walk or a predictable letter-to-symbol substitution; another may weigh it differently or use another method to estimate guesses.
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- FIDO Certified Security Key - Meets FIDO and FIDO2 standards. Works with Google, Microsoft, GitHub, Dropbox, and more. Please check service compatibility before purchase.
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- Check which scenario the displayed time represents: throttled online, unthrottled online, offline against a slow hash, or offline against a fast hash.
- Look for feedback on common passwords, words, names, dates, repeated characters, keyboard walks, and predictable substitutions.
- Prefer practical feedback about guessability over advice to add arbitrary character types just to satisfy a meter.
- Before entering any real password into an online checker, verify how that specific service handles the password. A checker’s score alone does not establish its privacy practices.
What should I do instead of chasing a high score?
Use a unique, long password when a password is required
Do not reuse a password across accounts. A password that is unique to one service limits the damage if that service’s credentials are exposed. Favor length over predictable substitutions, such as changing a letter to a symbol, which may still be recognized as a familiar pattern.
Let a password manager generate and store credentials
NIST recommends password managers for password-based accounts because they can generate and store long, unique passwords. NIST also advises choosing a manager that supports multifactor authentication (MFA). NIST: How Do I Create a Good Password?
Use passkeys or MFA where the service supports them
Passkeys can provide an alternative to typing a password. MFA adds another account-security option; neither changes what a password estimator measures. Use the sign-in protections available from the service rather than treating a strong meter reading as protection against phishing, malware, or weak account recovery.
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