Check how strong your password is online free - nothing is saved or sent to any server. Get instant feedback on length, complexity, entropy, and estimated crack time.
Password strength meters built into websites are often inaccurate - they reward simple rules (length + special character) while missing common weaknesses like predictable substitutions (P@ssw0rd) and dictionary words. A dedicated checker gives a more honest assessment.
Enter any password and get an instant strength assessment - checking for length, character variety, common patterns, and dictionary words - without sending your password to any server.
Check password strength before setting it for a new account, verify that a new password policy meets security requirements, test whether your current passwords are adequately strong, demonstrate password strength principles for security training, evaluate the effectiveness of password manager suggestions, and check whether adding complexity actually improves a weak base password.
The most common question is whether the entered password is stored or sent anywhere. Everything runs in your browser using JavaScript - no network requests are made when you type. Your password never leaves your device.
Type your password - it never leaves your browser.
Instantly see the strength rating: Weak, Fair, Strong, or Very Strong.
See breakdown: length, uppercase, numbers, symbols, entropy.
Read suggestions to improve your password if needed.
Common questions about this tool and how to use it.
Length is the most important factor - an additional character multiplies the attack space. A 16-character random password is exponentially stronger than a 10-character one. After length: character variety (uppercase + lowercase + numbers + symbols). After variety: unpredictability - avoiding dictionary words, names, dates, and predictable substitutions (P@ssw0rd is not strong despite meeting typical complexity requirements).
No - this tool runs entirely in your browser. The password is evaluated using JavaScript locally; no network request is made. You can verify this by disconnecting from the internet and opening the tool - it still works. Never enter passwords into online tools that send data to a server. A client-side strength checker like this one is safe to use with real passwords.
NIST SP 800-63B (2017, updated guidelines) recommends a minimum of 8 characters for human-generated passwords, but security professionals recommend 12–16 characters minimum for general accounts, and 20+ characters for high-value accounts (banking, email, password manager master password). Passphrases (4+ random words) like 'correct-horse-battery-staple' are both long and memorable.
Strength measures how hard the password is to crack by brute force or dictionary attack. Security also depends on: where the password is stored (is the site breached?), whether you reuse it across sites (one breach exposes all), whether you use two-factor authentication (adds a second layer even if the password is stolen), and whether the site hashes passwords correctly. A strong unique password + 2FA is genuinely secure.
Rules like 'must contain uppercase, number, and symbol' were designed when computers were slow. Modern GPU-accelerated attacks can test billions of passwords per second. Common patterns - Password1!, P@ssw0rd, Summer2024! - are in every cracking dictionary. A truly strong password is random and long, not just complex. A random 12-character password of any mix is far stronger than a predictable 12-character 'complex' password.
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