Strong Password Generator
A strong password generator creates passwords that meet the highest security standards — full character set, maximum randomness, and sufficient length. This free tool generates cryptographically secure strong passwords entirely in your browser using crypto.getRandomValues() — your passwords never leave your device.
What makes a password "strong"?
A strong password combines four elements: sufficient length (at least 12 characters, ideally 16+), character variety (uppercase, lowercase, numbers, and symbols), cryptographic randomness (not human-chosen), and uniqueness (never reused across accounts). NIST 2024 guidelines emphasize that length is the most important factor — a 16-character random password with mixed types is considered strong for virtually all use cases.
Strong password best practices
Beyond generating a strong password, protect it by storing it in a reputable password manager, enabling two-factor authentication on every account, and never reusing passwords. Even the strongest password can be compromised in a breach — the password manager and 2FA combination protects you when that happens.
Frequently Asked Questions
A strong password is at least 12–16 characters long, uses uppercase, lowercase, numbers, and symbols, is randomly generated (not human-chosen), and is unique to each account. NIST 2024 guidelines emphasize length above complexity.
A 16-character password using all character types (94-character pool) has ~105 bits of entropy. At 100 billion guesses per second, cracking it would take longer than the age of the universe — it is considered extremely strong.
Never. Even a perfect password becomes dangerous when reused, because a breach on one site gives attackers access to all your reused accounts. Use a password manager to generate and store unique passwords for every service.
NIST 2024 no longer recommends periodic forced password changes unless a breach is suspected. A strong, unique, randomly-generated password can remain in use indefinitely if not compromised.