Generate strong, random passwords instantly. Free, customisable, and 100% private — everything runs in your browser, nothing is ever sent to a server.
Last updated:
The average person reuses the same password across 14 different accounts. When one of those sites gets breached — and breaches happen constantly — every account sharing that password is compromised. This free strong password generator creates cryptographically secure random passwords using your browser's crypto.getRandomValues() API, the same randomness source used by security software. Passwords are generated locally and never transmitted anywhere.
Need a random password generator you can trust? Everything stays in your browser. No accounts, no server logs, no tracking.
The strength meter rates your password by entropy — the mathematical measure of unpredictability. Higher bits means exponentially more guesses needed to crack it. Here's what each level means for a password using all character types (uppercase + lowercase + numbers + symbols = 94 characters):
| Length | Entropy (bits) | Strength rating | Example use |
|---|---|---|---|
| 8 chars | ~52 bits | Weak | Avoid — crackable in hours with modern hardware |
| 12 chars | ~79 bits | Fair | Low-stakes accounts only |
| 16 chars | ~105 bits | Strong ✓ | Social media, shopping, forums |
| 20 chars | ~131 bits | Very Strong ✓✓ | Banking, email, work accounts |
| 24 chars | ~157 bits | Extremely Strong ✓✓✓ | Master password manager password |
Entropy = log₂(94length). A 1-bit increase doubles the guessing work. Going from 8 to 16 characters doesn't double the security — it cubes it.
Length matters more than complexity. A 20-character password using only lowercase letters has more entropy than a 10-character password using all character types. That said, combining length with character variety is best. A 20-character password with uppercase, lowercase, numbers, and symbols is the gold standard for a strong random password.
A passphrase like "correct-horse-battery-staple" (4 random words) is easier to remember and can be very secure — 4 random words from a 7,776-word list gives about 51 bits of entropy. A 16-character random password generator with full character set gives about 105 bits. For accounts you need to type regularly without a password manager, a passphrase is a reasonable trade-off. For everything else, use a random password stored in a manager.
Generate the password, immediately copy it, and paste it into your password manager before doing anything else. Don't type it manually — transcription errors are common with random strings. Don't save it in a text file, email it to yourself, or write it on a sticky note. A password manager (Bitwarden, 1Password, KeePass) is the right storage mechanism.
Enable two-factor authentication (2FA) on every account that supports it. A strong password plus 2FA means an attacker needs both your password and physical access to your second factor — a dramatically higher bar.
Passwords are generated entirely in your browser using the Web Crypto API. Nothing is sent to any server. The generated passwords exist only in your browser's memory until you copy them. Close the tab and they are gone.
Passwords are generated using the browser's built-in crypto.getRandomValues() API, which uses a cryptographically secure random number generator (CSPRNG). This is the same level of randomness used by security software and is suitable for generating real passwords.
A strong password is at least 16 characters long and uses a mix of uppercase letters, lowercase letters, numbers, and symbols. Avoid dictionary words, names, dates, or keyboard patterns like 'qwerty'. The strength meter on this tool rates your password in real time.
Passphrases (like 'correct-horse-battery-staple') are easier to remember and can be very secure if long enough. Random character passwords are harder to remember but slightly more resistant to brute force at the same length. For most accounts, a 20+ character random password stored in a password manager is the best approach.
Yes. This tool uses the Web Crypto API and never sends anything to a server. The generated passwords exist only in your browser's memory. Close the tab and they are gone. Always copy your password immediately and store it in a password manager.
Current security guidance (NIST SP 800-63B) recommends changing passwords only when you have reason to believe they have been compromised, not on a fixed schedule. Using a unique, strong password for every account is more important than frequent rotation.