Password Generator

What is a Password Generator?

A password generator creates random, unpredictable passwords by selecting characters from a defined character set. Using a random password generator for every account is one of the most effective ways to protect yourself against data breaches, phishing, and brute-force attacks.

This tool uses the browser's built-in crypto.getRandomValues() API to generate cryptographically secure random passwords — the same standard used by security tools and password managers. Your passwords are never transmitted or stored.

How to Use

1. 1Set the desired password length using the slider (4–128 characters).
2. 2Choose which character types to include: uppercase, lowercase, numbers, symbols.
3. 3Click Generate Password to create a new password.
4. 4Click Copy to copy it to your clipboard. Use ×10 to generate 10 at once.

Formula

Entropy bits = Length × log₂(Character Pool Size)

Character Pool Sizes:
  Lowercase only:      26 chars  → ~4.7 bits/char
  + Uppercase:         52 chars  → ~5.7 bits/char
  + Numbers:           62 chars  → ~5.9 bits/char
  + Symbols:           94 chars  → ~6.5 bits/char

Examples:
  12 chars, all types: 12 × log₂(94) ≈ 78 bits (Strong)
  16 chars, all types: 16 × log₂(94) ≈ 105 bits (Very Strong)
  20 chars, all types: 20 × log₂(94) ≈ 131 bits (Extremely Strong)

Frequently Asked Questions