Password Strength Checker
Check how strong your password is free. Type a password to see its strength score, a checklist of what makes it strong, and how long it would take to crack. Your password never leaves your browser.
Your password is checked only in this browser — it is never stored, uploaded or sent anywhere.
Password strength
Checklist
- At least 12 characters✗
- Uppercase letter (A–Z)✗
- Lowercase letter (a–z)✗
- Digit (0–9)✗
- Symbol (!@#$…)✗
- No common pattern (123, qwerty, password)✗
Crack time is a rough estimate assuming an attacker can try 10 billion guesses per second. Real attacks vary — a password manager and unique passwords per site matter more than any single score.
How to use
- Type a password into the box — it is checked as you type.
- Read the strength score, rating and estimated crack time.
- Fix the items marked ✗ in the checklist to make the password stronger.
Frequently asked questions
Is my password sent to a server?
No. The check runs entirely in your browser. Your password is never stored, uploaded, logged or sent anywhere — you can verify this by checking the page works offline.
What makes a password strong?
Length matters most: 12 or more characters, with a mix of upper- and lowercase letters, digits and symbols, and no common word or pattern. A long passphrase of random words is often stronger than a short complex one.
How is the crack time estimated?
From the password's entropy — how many possible combinations an attacker must try — assuming 10 billion guesses per second. It is a rough guide: a password reused from a data breach can be cracked instantly no matter how strong it looks.
Should I use a password manager?
Yes. A password manager creates and remembers a different strong password for every site, so one leak cannot compromise your other accounts. Turn on two-factor authentication wherever it is offered too.