Secure Password Checker
Check your password strength with detailed security analysis. All checking happens in your browser - your password is never sent anywhere.
Password Best Practices
- ✓ Use at least 12-16 characters (longer is better)
- ✓ Mix uppercase, lowercase, numbers, and symbols
- ✓ Use unique passwords for each account
- ✓ Consider using a passphrase (e.g., "correct-horse-battery-staple")
- ✓ Use a password manager to generate and store passwords
- ✗ Avoid personal information (names, birthdays)
- ✗ Avoid common words and predictable patterns
- ✗ Never reuse passwords across accounts
🔒 Privacy First: Your password is analyzed entirely in your browser. It is never sent to any server, logged, or stored anywhere.
How to Use
- Type or paste your password in the input field
- View the real-time strength analysis
- Review issues and improvement suggestions
- Adjust your password based on the feedback
- Use the toggle button to show/hide your password
About Password Security
Password strength is measured by how long it would take an attacker to guess your password. This depends on length, character variety, and randomness. A longer password with diverse characters exponentially increases the number of possible combinations.
Modern attackers use powerful GPUs that can test billions of passwords per second. They also use dictionaries of common passwords and patterns. A truly random 16-character password is virtually impossible to crack, while common 8-character passwords can be broken in minutes.
Frequently Asked Questions
Is it safe to enter my password in this checker?
Yes, this password checker runs entirely in your browser. Your password is never sent to any server or stored anywhere. All analysis happens locally on your device using JavaScript.
What makes a password strong?
A strong password is at least 12-16 characters long, contains a mix of uppercase, lowercase, numbers, and symbols, doesn't use dictionary words or common patterns, and is unique to each account. Avoid personal information like birthdays or names.
How does the password strength calculation work?
The checker analyzes multiple factors: length, character variety (uppercase, lowercase, numbers, symbols), common patterns (like '123', 'abc'), dictionary words, and known weak passwords. Each factor contributes to the overall score.
What are common password patterns to avoid?
Avoid sequential characters (123, abc), keyboard patterns (qwerty, asdf), repeated characters (aaa, 111), common substitutions (p@ssw0rd), dictionary words, personal information, and previously breached passwords.
How long would it take to crack my password?
Crack time depends on password complexity and attack method. A simple 8-character password can be cracked in hours. A 16-character random password with mixed characters could take billions of years. This tool estimates crack time based on brute-force attack assumptions.
Should I use a password manager?
Yes, password managers are highly recommended. They generate and store unique, complex passwords for each account, so you only need to remember one master password. This is much more secure than reusing passwords or using simple memorable passwords.