Generate cryptographically secure passwords instantly. Customizable length, character sets, and presets. Uses crypto.getRandomValues() for true randomness.
MatrixAI's password generator creates cryptographically secure passwords using your browser's built-in crypto.getRandomValues() API — the same entropy source used by password managers like 1Password and Bitwarden. Your passwords are never sent to any server.
| Length | Characters | Entropy | Estimated Crack Time |
|---|---|---|---|
| 6 | All types | ~39 bits | Seconds |
| 8 | All types | ~52 bits | Hours |
| 12 | All types | ~79 bits | Centuries |
| 16 | All types | ~105 bits | Billions of years |
| 20 | All types | ~131 bits | Heat death of universe |
| 32 | All types | ~210 bits | Unfathomable |
Unlike many online generators that use Math.random() (which is predictable and NOT cryptographically secure), this tool uses the Web Crypto API:
crypto.getRandomValues() provides cryptographically strong random valuesA passphrase like timber-rocket-plasma-novel-crisp is easier to remember and type, while still providing excellent entropy (~65 bits for 5 words from a 7,776-word list). For maximum security, random character passwords are stronger per character, but passphrases win on usability.
A strong password should be at least 16 characters long and include a mix of uppercase letters, lowercase letters, numbers, and symbols. Avoid dictionary words or personal information. Use a password manager to store unique passwords for each account — never reuse the same password across multiple sites.
Yes. This tool runs entirely in your browser using the Web Crypto API (crypto.getRandomValues()), which is cryptographically secure. Your passwords are never transmitted to any server, stored, or logged. You can safely generate passwords for banking, email, and other sensitive accounts.
Password entropy measures how unpredictable a password is, expressed in bits. Higher entropy means a stronger password. A 16-character password using all character types has ~105 bits of entropy, which would take billions of years to crack with a modern computer cluster using brute force attacks.
Security experts recommend at least 16 characters for most accounts and 20+ characters for critical accounts like email or banking. Length is the single most important factor — a 20-character lowercase-only password is stronger than a 10-character password with symbols.
A passphrase is a series of random words joined together (like "timber-rocket-plasma-novel"), while a password is a random mix of characters. Passphrases are easier to remember and type while still providing strong security. Five random words give roughly 65 bits of entropy — enough to be practically uncrackable.