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Generate cryptographically secure random passwords (6 to 64 chars) using the browser's Web Crypto API, with strength meter and optional uppercase, digits, and symbol character sets.
Utility
Generated on May 23, 2026
Generate cryptographically secure random passwords (6 to 64 chars) using the browser's Web Crypto API, with strength meter and optional uppercase, digits, and symbol character sets.
A password generator creates cryptographically secure random passwords using your browser's Web Crypto API — the same random-number source used by banks and encryption libraries. You can customize the length (6 to 64 characters) and choose which character sets to include: uppercase letters, lowercase letters, numbers, and special symbols. A built-in strength meter shows how resistant the generated password is to brute-force attacks.
Formula
Password = sequence of random characters drawn uniformly from the chosen sets, using crypto.getRandomValues (a cryptographically secure pseudo-random number generator).If you're generating a password right now, you've either been forced to rotate one by IT or you just heard about a breach and felt that creeping suspicion — am I one of the leaked emails? Most password guides obsess over length, but the variable that actually matters for cracking time is entropy: a 12-character random string of letters+numbers+symbols takes longer to brute-force than a 40-character sentence built from common dictionary words. The other quiet trap is reusability — even a perfect 24-char password is worthless if it's the same one you used on a forum that got dumped in 2019. Generate fresh, length-sized to the threat (16 chars for banking, 32 for password-vault masters), then drop it into your password manager so you literally never have to remember or type it again. Generation here is local — the string is produced by your browser's Web Crypto API, the same source banks use, and it never leaves the tab. Close the page and it's gone for everyone except your manager. Two-factor on top of a strong unique password is the real combination that stops account takeovers, not complexity rules from 2008 asking for one capital letter.
A password generator creates cryptographically secure random passwords using your browser's Web Crypto API — the same random-number source used by banks and encryption libraries. You can customize the length (6 to 64 characters) and choose which character sets to include: uppercase letters, lowercase letters, numbers, and special symbols. A built-in strength meter shows how resistant the generated password is to brute-force attacks. Generated passwords are never transmitted or stored; they exist only in your browser and on your clipboard once you copy them, ready to save into your password manager.
The Web Crypto API's crypto.getRandomValues fills an array with cryptographically-strong random values — unpredictable even if past outputs are known, unlike Math.random which is seed-based and unsuitable for security. Each random value is mapped into the allowed character set. Entropy per character equals log₂(charset size); for the full 94-character printable set at 16 characters, total entropy is about 105 bits — far beyond the reach of current and foreseeable brute-force hardware.
Estimated time for a modern GPU cluster (~10 billion guesses/sec) to brute-force passwords of different strengths.
| Length | Lowercase Only | Mixed Case + Digits | Mixed Case + Digits + Symbols |
|---|---|---|---|
| 6 chars | 31 sec | 5 min | 36 min |
| 8 chars | 6 hrs | 2 days | 28 days |
| 10 chars | 1 year | 2,000 years | ~200,000 years |
| 12 chars | 11,000 years | ~10 million years | 1.5 billion years |
| 16 chars | 5 × 10^11 years | ~10^18 years | Effectively unbreakable |
| 20 chars | Effectively unbreakable | Effectively unbreakable | Effectively unbreakable |
NIST recommends minimum 15 characters for important passwords in 2024 — old 8-char guidance is obsolete.
Every extra character increases crack time by ~94× (with full charset).
A 4-digit PIN has only 10,000 combinations — cracked in under a millisecond if unlimited attempts are allowed.
Password managers generate random 20+ character passwords and remember them for you — the gold standard.
A 16-character mixed-set password like K3v@9Pn$bXj!7Lq2 provides ~105 bits of entropy — unbreakable with current computing power.
A 20-character alphanumeric (letters + digits only) like a7Nk3Rm9PqBx5WvG2LzY gives ~119 bits — extremely strong.
An 8-character lowercase-only password like hfjkqoda has only ~38 bits — crackable by modern GPUs in under a day.
Best practice is to store every generated password in a reputable password manager (Bitwarden, 1Password, iCloud Keychain) rather than memorizing or writing them down.
Master passwords for vaults should be memorable but long — a 5-word Diceware passphrase like 'correct horse battery staple smile' provides strong entropy and is easier to remember than a random string.
For websites that reject special characters, use alphanumeric-only mode with 20+ characters to maintain strong security.
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