Password Strength Checker (Test Security, Free)

Why Check Password Strength?

Weak passwords (password123, qwerty, 12345678) are cracked instantly by brute-force attacks. Strong passwords use 12+ characters, mixing uppercase, lowercase, numbers, and symbols (!@#$%). A password strength checker evaluates entropy, pattern detection, and common password lists to score security—preventing account hijacking, data breaches, and credential stuffing attacks.

Common Use Cases

• Account creation: Test password strength before signing up for services
• Security audits: Evaluate existing passwords for vulnerabilities
• Password policies: Verify passwords meet company requirements (8+ chars, symbols, etc.)
• User onboarding: Guide users to create strong passwords during registration
• Compliance: Ensure passwords meet security standards (NIST, PCI DSS, HIPAA)
• Education: Teach users what makes passwords secure vs. vulnerable

Why This Tool?

• Real-time feedback: See strength score as you type—adjust immediately
• Pattern detection: Identifies common patterns (123456, qwerty, repeated chars)
• Actionable tips: Get specific recommendations to improve weak passwords
• 100% client-side: Passwords never leave your browser—complete privacy
• Free forever: Unlimited password checks with no rate limits

Pro tip: After checking strength, use our Password Generator to create cryptographically secure passwords. For storing passwords, use our Hash Generator with SHA-256 + salt.