Free Password Strength Checker — Test Your Password Security
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Is Your Password Actually Strong? Find Out in Seconds.

Type any password to get a live strength meter, an entropy-based security score, and a realistic estimate of how long it would take a hacker to crack it — all 100% private, right in your browser.

Enter a password
–Entropy (bits)
–Time to crack (offline)
–Length
–Time to crack (online)

Strength checklist

    How to make it stronger

      Crack-time estimates assume a modern offline attack at 10 billion guesses per second and a throttled online attack at 100 guesses per second. Real-world times vary with the hashing method used. Never share real passwords with anyone — this page sends nothing over the network.

      100% private

      Every calculation runs locally in your browser. Your password is never sent, stored, or logged anywhere.

      No signup

      No account, no email, no tracking pixels. Open the page and start testing instantly.

      Free forever

      Unlimited password checks with no paywall and no feature limits.

      How to use the Password Strength Checker

      1. 1Type or paste a password

        Enter the password you want to test into the box at the top. Nothing you type ever leaves your device.

      2. 2Watch the meter update live

        The strength bar, score, entropy bits, and crack-time estimates update with every keystroke — no button to press.

      3. 3Read the checklist and tips

        The checklist shows exactly which strength rules your password passes or fails, and the tips tell you precisely what to change.

      4. 4Strengthen until it scores Strong

        Add length, mix character types, and remove common words until the meter reaches Strong or Very Strong — then use Show to double-check before saving it in a password manager.

      What makes this checker different

      Real entropy scoring

      Strength is calculated from actual password entropy — character pool size and length — not just a checklist of character types.

      Honest crack-time estimates

      See how long your password survives both a throttled online attack and a fast offline brute-force attack, expressed in plain terms like minutes, years, or centuries.

      Common-pattern detection

      Detects dictionary words, leaked-password classics, keyboard walks like “qwerty”, number sequences like “12345”, and repeated characters — then heavily penalizes the score.

      Actionable improvement tips

      Instead of a vague score, you get specific guidance: add length, mix cases, drop the dictionary word, and more.

      Private by design

      The entire analysis is client-side JavaScript. There is no server endpoint to receive your password, so nothing can leak.

      Mobile-friendly live meter

      Fully responsive layout with a large input and show/hide toggle, so you can test passwords comfortably on your phone.

      Password strength FAQs

      Is my password sent to a server when I check it?
      No. This checker runs entirely in your browser using JavaScript — there is no form submission, no analytics event carrying your password, and no network request at all. You can even disconnect from the internet after the page loads and it will keep working.
      How is the “time to crack” estimate calculated?
      We estimate the password’s entropy in bits from its length and character variety, then subtract penalties for common words, sequences, keyboard patterns, and repeats. The number of guesses an attacker needs is 2 to the power of the entropy. We divide that by 10 billion guesses per second (a fast offline attack against a weak hash) and by 100 guesses per second (a throttled online login attack). Actual times depend on the site’s password hashing — strong hashing like bcrypt makes cracking far slower.
      What actually makes a password strong?
      Length matters more than complexity. A random 16-character password using mixed cases, numbers, and symbols has far more entropy than an 8-character one with tricky substitutions. Uniqueness matters too: a strong password reused across ten sites is only as safe as the weakest site.
      Is “Password123!” strong?
      No — and this checker will score it Very Weak. It is short, built on the most common dictionary word in leaked-password lists, and the “123!” ending is the most predictable suffix attackers try first. Pattern detection catches all of that.
      What is a passphrase, and is it better?
      A passphrase is several random words strung together, like “correct horse battery staple”. Four or more truly random words give strong entropy and are easier to remember than gibberish. Just avoid song lyrics, quotes, or common phrases — pick the words randomly.
      Should I use a password manager?
      Yes. A password manager lets you use a unique, long, random password for every site without having to memorize them. Try our free Password Generator to create one, then store it in your manager of choice.
      How often should I change my passwords?
      Forced rotation every 90 days is outdated advice. What matters is that each password is long and unique. Change a password immediately if the site reports a breach or you reused the password somewhere that was breached.
      What does “entropy” mean here?
      Entropy, measured in bits, is how unpredictable your password is to an attacker. A coin flip has 1 bit of entropy; a 12-character random password drawn from all 94 printable characters has about 79 bits — meaning an attacker needs roughly 279 guesses on average. Every bit you add doubles the work for the attacker.

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