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About This Calculator
Strong passwords are your first line of defense against brute-force attacks and credential theft. This generator creates cryptographically random passwords using customizable combinations of uppercase letters, lowercase letters, numbers, and special characters. A 16-character mixed password would take modern computers billions of years to crack through brute force.
Quick Tips
- 1 A 16-character random password with mixed symbols takes centuries to brute-force.
- 2 Avoid dictionary words even with substitutions — attackers test those first.
- 3 Use a unique generated password per account to prevent credential stuffing.
Example Calculation
Generate a 16-character password with uppercase, lowercase, numbers, symbols.
Entropy: ~105 bits | Crack time: centuries | Character sets: 4 | Strength: very strong
Why Strong Passwords Matter
Weak passwords are the leading cause of data breaches. A 6-character lowercase password can be cracked in seconds. A 16-character password with mixed character types would take billions of years to brute-force with current technology.
What Makes a Password Strong
Strong passwords are at least 12 characters long, use a mix of uppercase, lowercase, numbers, and symbols, avoid dictionary words and personal information, and are unique for each account. Length is the most important factor.
Password Strength Levels
Weak: under 8 characters or single character type. Fair: 8-11 characters with 2 types. Good: 12-15 characters with 3 types. Strong: 16+ characters with all 4 types. Each additional character exponentially increases cracking difficulty.
Best Practices for Password Management
Use a unique password for every account. Store passwords in a reputable password manager. Enable two-factor authentication wherever available. Never share passwords via email or text. Change passwords immediately if a breach is reported.
Frequently Asked Questions
At minimum 12 characters, but 16 or more is recommended. Each additional character multiplies the number of possible combinations. A 16-character password with all character types has about 3.4 x 10^31 possible combinations.
Both can be strong. A random 16-character password is very secure. A passphrase of 4-5 random words (like "correct-horse-battery-staple") is easier to remember and also very secure if the words are truly random.
NIST guidelines no longer recommend routine password changes. Change passwords only when there is reason to believe they have been compromised, such as after a data breach notification. Focus on using unique, strong passwords instead.
The password is generated entirely in your browser using JavaScript. No passwords are sent to any server or stored anywhere. Each time you calculate, a new random password is generated using Math.random().