A password can look complicated and still be weak, or look simple and be strong. This checker explains the difference: type a password and see its estimated entropy in bits, a plain-language strength rating, and an estimate of how long a guessing attack would take at different speeds. A checklist shows exactly which properties help or hurt — length, mixed cases, digits, symbols, and patterns an attacker would try early. The password is analysed entirely on your device and is never sent anywhere.
How the Estimate Works
Entropy is estimated from the pool of characters the password draws from and its length: more characters from a bigger pool means more combinations to guess. The crack-time table translates that into time at offline and online guessing rates, which shows why a few extra characters beat a fistful of symbols. The checker also screens against a built-in list of very common passwords and looks for repeats and keyboard sequences like 1234 or qwerty, which automated attacks always try first.
How to Check a Password
- Type or paste the password into the field (use the eye toggle to view it).
- Read the strength meter and the entropy in bits.
- Scan the crack-time estimates for a realistic picture.
- Work through the checklist and fix what is flagged.
- Re-check until the rating is strong — then use the final password where you need it.
Honest Limits
Every checker estimates; none can promise a password is unbreakable. A passphrase of several random words scores well here and is easier to remember than symbol soup. Reusing one strong password on many sites is still risky, because breaches expose passwords regardless of strength — a password manager plus two-factor authentication is the real fix.
Frequently Asked Questions
Is it safe to type a real password here?
The analysis runs 100% locally in your browser — nothing is transmitted or stored. Even so, testing a close variant and then using the real one is a cautious habit.
Why is my long password rated weaker than expected?
Common words, names, dates and sequences shrink the effective search space. The checklist flags the specific pattern so you can swap it out.
Does this tool generate passwords?
No. It only checks strength, so you can evaluate passwords from your manager or your own passphrase ideas.