A weak password is the easiest door into your accounts, yet most people have no idea how strong their passwords really are. Our free Password Strength Checker gives you an honest, instant verdict: it scores any password from 0 to 100 using true entropy math — password length multiplied by the logarithm of the character pool actually used — instead of guessy rules like “add an exclamation mark”. No signup, no account, and no record kept anywhere.
Beyond the score, you get a plain-language strength band (from Very Weak to Very Strong), a human-readable estimate of how long a brute-force attack would take at ten billion guesses per second, and a clear checklist showing exactly which ingredients your password is missing. Below that, tailored improvement tips explain how to fix it — usually by making it longer, not just weirder.
It is perfect for anyone who reuses passwords across sites, IT staff auditing password policies, and students learning how password security works. A critical promise: the check runs entirely in your browser, so your password never leaves this page and can never be intercepted in transit.
Password Strength Checker
Test how strong a password is with entropy-based scoring, crack-time estimates and instant improvement tips.
Checked locally in your browser — your password never leaves this page.
How to use
- Type a password into the password field — the score updates live as you type.
- Use the Show button to reveal what you typed if you want to check each character.
- Read the score out of 100 and the strength band (Very Weak, Weak, Fair, Strong, Very Strong).
- Check the estimated crack time — it shows what ten billion guesses per second would need, from seconds up to centuries.
- Review the checklist (length of at least 12 characters, uppercase, lowercase, digit, symbol) to see what is missing.
- Follow the improvement tips, then tweak your password and watch the score rise.
FAQs
Why does length matter more than complexity?
Password entropy — the real measure of strength — grows linearly with every character you add, but only slowly when you add new symbol types. A 16-character passphrase of ordinary words usually beats an 8-character tangle of symbols, and it is easier to remember.
Is it safe to type a real password into this tool?
Yes. The check runs entirely in your browser with JavaScript — nothing is sent to any server, logged, or stored. You can verify this by disconnecting from the internet and watching it still work.
What does the crack-time estimate assume?
It assumes an attacker can try ten billion guesses per second, which represents a well-resourced offline attack against a stolen password hash. Online logins are much slower and usually rate-limited, but hashes do get stolen — so plan for the offline number.