How Strong Is
Your Password?

A strong password is long, unique, and unpredictable. The single most important factor is length — every additional character multiplies the number of possible passwords an attacker has to try. Modern security guidance from NIST recommends passphrases of 12+ characters over shorter passwords stuffed with special characters. This tool uses zxcvbn, the open-source password strength estimator developed at Dropbox, which measures real-world guessability against dictionaries, common patterns, keyboard walks, dates, and 30,000+ known-breached passwords.

This tool uses zxcvbn, an open-source password strength estimator that goes far beyond the length/character-class rules most sites still use. zxcvbn scores passwords against dictionaries of common words, names, common passwords, l33t-speak substitutions, keyboard patterns like qwerty and asdfgh, dates, and repeats. It returns an estimated number of guesses an attacker would need — not just a length check. That is why "Password123!" gets a low score even though it meets typical complexity rules.

No. This tool runs 100% in your browser using the zxcvbn library loaded from your device. Your password is never transmitted to CyberFence, never logged, never stored, and never associated with any account. Close the tab and everything is gone. If you want to verify, open your browser DevTools Network tab while you type — you will see zero requests carrying your password.

For any account you care about — email, banking, work — aim for zxcvbn score 4 (Strong). That corresponds to an estimated 10 billion+ guesses required to crack, which is beyond what a well-funded attacker can attempt against a properly-configured login system. Score 3 (Good) is acceptable for lower-stakes accounts. Anything at score 0-2 should be changed immediately.

Length beats complexity. A 16-character passphrase of random common words ("correct-horse-battery-staple") is stronger and easier to remember than an 8-character password with symbols ("P@ssw0rd!"). NIST SP 800-63B guidance dropped the old complexity rules years ago and now emphasizes length: 12 characters minimum, 16+ recommended for anything sensitive. This tool factors length into the score directly — you will see the crack estimate jump exponentially as you add characters.

Yes. The realistic security ceiling for human-memorized passwords is one strong password. Beyond that, unique strong passwords across dozens of accounts requires a password manager — either the OS-native one (iCloud Keychain, Google Password Manager, Windows Hello) or a dedicated service like 1Password or Bitwarden. Combined with breach monitoring (so you know when a service leaks) and a VPN (so login traffic is encrypted end-to-end), that closes the credential-theft attack surface almost entirely.

CyberFence does not store your third-party passwords. Your CyberFence account password itself is hashed with an Argon2id-family key-derivation function and per-user salt — even a full database compromise on our side does not yield usable credentials. If you want CyberFence to alert you when one of your accounts appears in a public breach, use Breach Monitor. If you want to prevent phishing attacks that harvest passwords in the first place, Web Shield blocks known malicious domains before you can hand over credentials.