Password Generator
Free online Password Generator.
Calculator
How to Use
- Enter the required values
- Click Calculate to see the result
- Review the detailed output
Formula
Entropy = log2(charset_size) x password_length. Charset: lowercase(26) + uppercase(26) + digits(10) + symbols(32) = 94 chars. 12-char password: ~79 bits entropy.
Example Calculations
Strong Password
Input: Length: 16, Include: upper, lower, numbers, symbols
Result: Example: K#9mP$vL2xR&nQ4w (79 bits entropy)
PIN Code
Input: Length: 6, Digits only
Result: Example: 847291 (19.9 bits entropy)
Memorable
Input: Length: 12, Letters and numbers
Result: Example: aB3kM9pQ7rT2 (63 bits entropy)
About This Calculator
Free online password generator. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.
Our password generator is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.
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Frequently Asked Questions
What makes a strong password?
12+ characters, mix of upper/lower/numbers/symbols, no dictionary words or personal info.
How long to crack a password?
8 chars: hours. 12 chars: centuries. 16 chars: millions of years. Length matters most.
Use a password manager?
Yes, generates unique passwords per account. Only remember one master password. Prevents reuse.
What is 2FA?
Two-factor authentication adds verification beyond password: authenticator app code or hardware key.
How often change passwords?
Only when compromised. Use unique strong passwords everywhere and enable 2FA instead.