Secure password generator
Secure password generator: use password length, allowed characters. Review the formula, worked example and calculation steps.
Inputs
Use the units shownEnter your values and select Calculate.
Formula & explanation
Variables & units
- Password length
- Numeric value · minimum 12, maximum 128
- Allowed characters
- Select an option
Worked example
A 20-character password drawn from 80 allowed symbols has about 126 bits of selection entropy.
Assumptions
No account is needed. Automatic history, in-app saving, input-sharing links and CSV export are disabled. Random selection does not guarantee every character class appears; use an appropriate password manager and follow the destination site’s rules.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Calculated on your device. Automatic history is disabled for these inputs.