Password Strength Checker
See how strong a password is and roughly how long it would take to crack. You get its estimated entropy, the weaknesses we spot, and tips to make it stronger — all computed in your browser.
New to this? Read the Password Strength guide →
🔒 Nothing is uploaded — the password is analysed locally and never leaves this tab.
Enter a password to begin.
- Length
- 0
- Entropy (bits)
- 0
- Time to crack
- —
The crack-time estimate assumes a fast offline attack of about 10 billion guesses per second against an unsalted, fast hash. It is a guide, not a guarantee — a strong password is still no substitute for a password manager and two-factor authentication.
Need a strong one? Use the Password Generator →
Frequently asked questions
Is it safe to type my password here?
Yes. The check runs entirely in your browser — your password is never sent over the network, stored, or logged. As a habit, only ever test passwords on sites you trust, or test ones with the same length and character mix as your real one.
How is the crack time calculated?
We estimate the size of the character set you used and combine it with the length to get the number of possible combinations (its entropy in bits), then divide by an assumed guessing speed of 10 billion guesses per second. Real attacks vary, so treat it as a guide.
What makes a strong password?
Length matters most: a long passphrase of several random words beats a short string of symbols. Avoid common passwords, dictionary words, names, dates and keyboard patterns, and use a unique password for every account.