Password Generator
Generate strong, cryptographically random passwords. Uses crypto.getRandomValues() — nothing is sent to any server.
Why You Need a Strong Random Password Generator
Weak passwords are the #1 cause of data breaches. According to security research, over 80% of hacking-related breaches involve stolen or weak passwords. A strong password must be sufficiently long, truly random, and unique to each account. Human-chosen passwords tend to follow predictable patterns (dictionary words, dates, keyboard patterns) that attackers exploit with brute-force and dictionary attacks.
What Makes a Password Cryptographically Secure?
This generator uses crypto.getRandomValues() — the browser's Cryptographically Secure Pseudo-Random Number Generator (CSPRNG). Unlike Math.random(), which produces predictable sequences, the Web Crypto API generates randomness from the operating system's entropy pool, making passwords truly unpredictable and safe for security use.
Password Security Best Practices for 2026
- Use at least 16 characters — Every additional character exponentially increases brute-force difficulty. 16+ chars is the modern recommendation.
- Mix all four character types — Uppercase (A-Z), lowercase (a-z), digits (0-9), and symbols (!@#$%^&*) maximize entropy
- Never reuse passwords across accounts — If one site is breached, credential stuffing attacks will compromise all your other accounts
- Use a password manager — Store generated passwords in a manager like Bitwarden, 1Password, or KeePass instead of memorizing them
- Enable two-factor authentication (2FA) — A strong password plus 2FA provides defense-in-depth against account compromise
- Avoid personal information — Never include names, birthdays, pet names, or addresses in passwords
Password Entropy and Strength Calculation
Password strength is measured in bits of entropy. A password with N characters from a pool of C possible characters has approximately N — log2(C) bits of entropy. For example: a 16-character password using all 95 printable ASCII characters has ~105 bits of entropy — requiring trillions of years to brute-force with current hardware. This tool's strength meter visualizes entropy as Weak/Fair/Good/Strong.