Password generator
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- Each character is drawn uniformly from 80 possible characters using the browser's secure random generator, rejecting values that would bias the result.
- Length matters most: each extra character multiplies the possibilities by 80. Use a different password for every account, ideally in a password manager.
How to use it
Each character is drawn uniformly from the allowed set using your browser's secure random generator, rejecting values that would bias the result. A 16-character password drawn from 80 characters has about 101 bits of randomness, far beyond what can be guessed.
The passwords exist only on your screen: nothing is stored or sent. Use a different password for every account and keep them in a password manager.
Frequently asked questions
Is this password generator safe?
The passwords are created in your browser with the secure random generator and are never sent anywhere.
How long should a password be?
Length matters most; 16 or more random characters is strong.
Should I reuse passwords?
No; use a unique password for each account.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
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General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.