Strong Password Checker Tool
Test your password strength instantly with our advanced security analyzer
Why Use a Password Strength Checker?
Weak passwords are responsible for 81% of data breaches. Our password checker analyzes your password in real-time, providing instant feedback on strength, vulnerabilities, and suggestions for improvement without storing or transmitting your data.
Security Criteria
- At least 8 characters
- Contains uppercase letters
- Contains lowercase letters
- Contains numbers
- Contains special characters
- Not a common password
Password Analysis
Enter a password to see detailed analysis
Security Score
Based on length, complexity, and patterns
How to Create Strong Passwords
Strong passwords should be at least 12 characters long, include a mix of uppercase and lowercase letters, numbers, and special characters. Avoid using personal information, dictionary words, or common patterns. Consider using passphrases with random words for better security and memorability.
Privacy & Security First
Your password is never sent to our servers or stored anywhere. All analysis happens locally in your browser using JavaScript. This ensures complete privacy and security while testing your password strength. No data is collected, transmitted, or stored during the checking process.
Avoid Common Mistakes
- • Don’t use personal information
- • Avoid dictionary words
- • Skip keyboard patterns (123456, qwerty)
- • Don’t reuse passwords across sites
Password Best Practices
- • Use a unique password for each account
- • Enable two-factor authentication
- • Update passwords regularly
- • Use a password manager
Crack Time Estimates
Enter a password to see how long it would take to crack using various methods including brute force and dictionary attacks.
Frequently Asked Questions
Is it safe to enter my password into this tool?
Yes, it’s completely safe. This tool runs entirely in your browser using JavaScript. Your password is never sent to any server, stored, or transmitted anywhere. All analysis happens locally on your device, ensuring complete privacy and security.
What makes a password strong?
A strong password typically has at least 12 characters, includes a mix of uppercase and lowercase letters, numbers, and special characters. It should avoid common words, personal information, and predictable patterns. The longer and more random the password, the stronger it is.
How does the password strength calculation work?
Our tool analyzes multiple factors including password length, character variety, entropy, common patterns, and checks against known weak passwords. The score is calculated based on estimated crack time, complexity, and adherence to security best practices.
Should I use the same strong password for multiple accounts?
No, never reuse passwords across different accounts. Even if you create a very strong password, using it for multiple accounts means that if one service is compromised, all your accounts become vulnerable. Use a unique strong password for each account and consider using a password manager.
What are passphrases and are they better than passwords?
Passphrases are longer passwords made up of multiple words, often easier to remember than complex character combinations. They can be very secure when they’re long enough and use random, unrelated words. For example, “correct-horse-battery-staple” is both memorable and strong.
How often should I change my passwords?
Modern security experts recommend changing passwords only when there’s evidence of compromise or when using weak passwords. Focus on creating strong, unique passwords and enabling two-factor authentication rather than frequent password changes, which can lead to weaker passwords.
What is two-factor authentication and should I use it?
Two-factor authentication (2FA) adds an extra layer of security by requiring a second form of verification beyond your password. This could be a text message, app notification, or hardware key. Yes, you should enable 2FA wherever possible, as it significantly increases account security even if your password is compromised.
Are password managers safe to use?
Yes, reputable password managers are generally very safe and are recommended by security experts. They use strong encryption to protect your passwords and can generate unique, strong passwords for each account. The convenience and security benefits far outweigh the risks for most users.