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Password Strength Test

Password Strength Test

Estimate password strength and review practical ways to make passwords longer, stronger, and unique.

Password Strength Tester helps you estimate whether a password is likely to resist guessing attacks. The tool checks length, character variety, common weak patterns, estimated entropy, and practical recommendations without displaying the tested password in the result.

A strong password matters because passwords are often the first barrier protecting email, banking, cloud storage, social media, and work accounts. A unique password for every account matters just as much: if one website is breached, reused passwords can let attackers try the same credentials on other services.

Password Strength Test

Enter the required values and run the tool to view results.

Estimate password strength using length, character variety, pattern checks, and practical password safety guidance.

Password to analyze Show password For privacy, avoid testing a password you currently use on a real account.

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How to use Password Strength Tester

Enter a password or passphrase to analyze. The result shows an estimated strength score, length, character-class coverage, entropy estimate, pattern warnings, and recommendations. For privacy, avoid testing a password you currently use on a real account.

What makes a password stronger?

Length is one of the most important factors. NIST guidance for digital identity systems requires at least 15 characters for passwords used as a single authentication factor and recommends allowing long passwords. Long random passwords and random multi-word passphrases are usually stronger and easier to manage than short passwords with predictable substitutions.

Character variety can help, but complexity alone is not enough. A short password such as Password1! follows common composition rules but is still predictable. A longer random password or passphrase is usually more resistant to guessing than a short password with obvious capitalization, numbers, or symbols.

Why every account needs a unique password

Password reuse turns one breach into many possible account takeovers. If an attacker obtains a reused password from one compromised site, they can try it against email, banking, shopping, social media, and work accounts. Unique passwords contain the damage: one exposed password should not unlock your other accounts.

Best practices

Use a password manager to generate and store unique passwords for each account. Turn on multi-factor authentication for important accounts, especially email, financial services, cloud storage, and administrator accounts. Change a password immediately if you know it was exposed, shared, phished, or used on a breached service.

Reference guidance

For additional guidance, see NIST SP 800-63B and the FTC guidance on protecting online accounts with strong passwords and two-factor authentication.

Password Safety Tips

Prefer long, unique passwords or passphrases. Do not reuse passwords across accounts. Store them in a reputable password manager, and add multi-factor authentication wherever possible. A strength score is only an estimate; it does not confirm whether a password has appeared in a data breach.