Free Secure Password Strength Checker

How is Password Strength Evaluated?

Password strength is a measure of a password's resistance to guessing or brute-force attacks. Rather than relying on simple checks (like checking for capital letters or symbols), modern security evaluators calculate password entropy. Entropy, measured in bits, measures the mathematical unpredictability of a password based on character length, character pool diversity (lowercase, uppercase, numbers, symbols), and common dictionary words or patterns.

Strict Security and Privacy Protection

Security is our top priority. Our Password Strength Checker operates entirely on the client-side using JavaScript. This means all analysis and calculations occur locally in your browser: your password is never sent over the internet or transmitted to our servers. You can verify this by checking your browser's network panel or running the tool offline.

Best Practices for Secure Passwords

• Use Length Over Complexity: A longer password (e.g., a passphrase of four random words like "correcthorsebatterystaple") is significantly harder to crack than a short, complex one (e.g., "P@$$w0rd").
• Avoid Common Words: Do not include your name, birthdate, sequential numbers (12345), or keyboard patterns (qwerty).
• Use a Password Manager: Generate and store unique passwords for every service to prevent credential stuffing attacks if one site is breached.

If you need to generate a secure password, use our Password Generator, or hash passwords using our Bcrypt Generator.