About Generate-Password.Online

A secure client-side password generator with multiple modes and entropy calculation.

Overview

Generate-Password.Online is a free, secure, client-side password generator that creates strong passwords using cryptographically secure random number generation. All operations happen locally in your browser, ensuring complete privacy and security.

Generation Modes

Random Mode

Generates completely random passwords from a customizable character set. You can control length (4-128 characters) and choose to include lowercase, uppercase, digits, and symbols. Options to exclude ambiguous characters and ensure at least one character from each selected type.

Pronounceable Mode

Creates passwords that are easier to remember by alternating consonants and vowels to form syllable-like patterns. Optionally includes numbers and symbols for added security.

Passphrase Mode

Generates memorable passphrases by combining random words from a curated wordlist. Highly secure due to the large number of possible combinations while remaining easy to remember.

Pattern Mode

Allows you to specify a custom pattern using a mask format (L=letter, U=uppercase, l=lowercase, N=digit, S=symbol, ?=any). Perfect for systems with specific password requirements.

Security

Cryptographically Secure:

We use window.crypto.getRandomValues() for all random number generation, ensuring cryptographic security.

Client-Side Only:

All password generation happens locally in your browser. No passwords are ever sent to any server or stored anywhere except your local storage (if you choose to save profiles).

No Analytics:

We don't track your usage, collect any data, or use analytics tools. Your privacy is paramount.

Entropy Calculation

Password strength is measured using entropy, calculated as:

Entropy = Length × log₂(Pool Size)

Where Pool Size is the number of possible characters. For example:

  • Lowercase only: 26 characters
  • Lowercase + Uppercase: 52 characters
  • Lowercase + Uppercase + Digits: 62 characters
  • All types: ~94 characters

A password with 80+ bits of entropy is considered very strong and would take centuries to crack with current technology.

Best Practices

  • Use passwords with at least 12-16 characters
  • Include multiple character types (letters, numbers, symbols)
  • Never reuse passwords across different services
  • Use a password manager to store your passwords securely
  • Enable two-factor authentication (2FA) where available
  • Consider using passphrases for passwords you need to remember
  • Change passwords if you suspect they may have been compromised

Technology

Built with modern web technologies:

  • Next.js 14 with App Router
  • TypeScript for type safety
  • Tailwind CSS for styling
  • Web Crypto API for secure randomness
  • Local Storage API for settings persistence

Contact

Have questions or suggestions? Visit our website at generate-password.online