Password Strength Checker

Scope

The password strength checker evaluates your password based on five criteria: presence of lowercase letters, uppercase letters, special characters, minimum length of 8 characters, and minimum length of 13 characters. The more criteria your password meets, the stronger it is rated.

All password checking is done entirely in your browser. Your password is never sent to any server or stored anywhere.

About Passwords

A strong password is your first line of defense against unauthorized access to your accounts. Good passwords are long, use a mix of character types, and avoid common words or patterns. Consider using a password manager to generate and store unique passwords for each of your accounts.

What Makes a Strong Password

Security researchers generally agree that a strong password should meet most or all of the following criteria:

• At least 12 characters long, ideally 16 or more
• A mix of uppercase and lowercase letters
• Includes numbers and special characters (!@#$%^&*)
• Not a dictionary word or common phrase
• Not based on personal information (names, birthdays, pet names)
• Unique for each account, never reused across services

Common Password Mistakes

Even security-aware users sometimes fall into patterns that weaken their passwords. Here are mistakes to avoid:

• Predictable substitutions:Replacing letters with numbers in obvious ways (e.g., “p@ssw0rd”) does not significantly increase security. Attackers account for these substitutions in their tools.
• Keyboard patterns:Sequences like “qwerty”, “123456”, or “asdfgh” are among the first combinations tested in a brute-force attack.
• Short passwords with special characters: A 6-character password with symbols is far weaker than a 16-character password using only lowercase letters. Length matters more than complexity.
• Reusing passwords: If one service is compromised, attackers will try the same password on your other accounts. This is known as credential stuffing.

Password Managers

A password manager is software that generates, stores, and auto-fills strong, unique passwords for each of your accounts. Instead of remembering dozens of complex passwords, you only need to remember one master password. Most modern password managers also support biometric authentication and two-factor authentication for added security.

Two-Factor Authentication

Even with a strong password, enabling two-factor authentication (2FA) adds a critical second layer of protection. With 2FA enabled, logging in requires something you know (your password) and something you have (a phone, hardware key, or authentication app). This means that even if your password is compromised, an attacker still cannot access your account without the second factor.

Your Privacy

This password strength checker processes your input entirely within your web browser using client-side JavaScript. Your password is never transmitted over the network, never sent to our servers, and never stored anywhere. You can verify this by using your browser's developer tools to inspect network traffic while using the tool, no requests are made when you type.

Frequently Asked Questions