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Password Strength Checker: How to Create & Verify Strong Passwords

Password security is the first line of defense for your digital life. Yet most people still use passwords like "123456" or "password." A password strength checkercan instantly tell you whether your passwords would survive a real-world attack — and this guide will teach you what to do about it.

What Makes a Password Strong?

Password strength is measured by entropy— essentially, how many guesses an attacker would need to crack it. Entropy increases with:

• Length:Each additional character multiplies the possible combinations exponentially.
• Character variety:Uppercase, lowercase, digits, and symbols all expand the search space.
• Randomness:Patterns, dictionary words, and personal info make passwords predictable.

The golden rule:A 12-character random password with mixed characters is exponentially stronger than a 20-character dictionary phrase.

Common Attack Methods

Brute Force

The attacker tries every possible combination. A modern GPU can try billions of combinations per second. An 8-character lowercase password falls in minutes.

Dictionary Attacks

Attackers don't try random strings first. They try lists of common passwords, dictionary words, and known leaked passwords. "Sunshine2024!" will be cracked nearly instantly, even though it has 14 characters.

Credential Stuffing

If your password was leaked in a breach elsewhere, attackers try it on other sites. This is why every account needs a unique password.

Using a Password Strength Checker

Our password strength checkerevaluates your password against all these attack vectors and gives you a score from "Very Weak" to "Very Strong." It checks for:

• Length and character composition
• Common patterns and keyboard walks
• Dictionary word detection
• Repeated characters and sequences

How to Create Strong Passwords

1. Use a passphrase:"correct-horse-battery-staple" is easy to remember, hard to crack.
2. Add complexity:Replace letters with symbols (but don't follow obvious patterns like "p@ssw0rd").
3. Make it long:16+ characters is ideal. Each character adds entropy.
4. Never reuse:Every account needs its own unique password.
5. Use a password manager:Generate and store complex passwords so you don't need to remember them.

Two-Factor Authentication (2FA)

A strong password is essential, but 2FA makes you nearly impervious to remote attacks. Even if your password is compromised, attackers need the second factor to log in. Always enable 2FA where available.

Checking Your Password's Strength

Ready to check your passwords? Use our password strength checkerto test your current passwords and generate stronger alternatives.