Is this generator truly secure?

Yes. It uses crypto.getRandomValues, the browser's built-in cryptographically secure random number generator. This is fundamentally different from Math.random, which is deterministic and predictable. The Web Crypto API is designed and reviewed specifically for cryptographic use and is trusted by banks, password managers, and security-critical software.

Does this tool save or transmit generated passwords?

No — absolutely not. Passwords are generated entirely in your browser and are never sent to any server, logged, or persisted after you close the page. The recommended workflow is to generate the password, copy it immediately to a password manager, and discard the browser tab.

What password length should I use?

Minimum 12 characters for low-value sites; 16+ for most accounts; 20+ for critical services (email, banking, password manager master). For extremely sensitive use (cryptocurrency wallet seed phrases, offline backups), use 25+ or switch to a Diceware-style passphrase. Always prefer longer passwords over complex-but-short ones.

Should I include symbols in my passwords?

Yes, whenever the website accepts them. Each additional character class exponentially increases the search space an attacker must brute-force. Some legacy websites still reject symbols — in that case, compensate with more length (20+ characters) using the remaining classes to maintain entropy.

Can I memorize generated passwords?

Not easily — that is the point. Random passwords are intentionally difficult to memorize, which is why password managers exist: they remember your passwords so you do not have to. For the handful of passwords you must memorize (master password, device unlock), use a long memorable passphrase of 4–6 random words instead.

Why are password managers better than memorizing passwords?

Humans reuse memorable passwords across sites, which means one data breach compromises many accounts. Password managers store a unique, strong, random password for every site, so a breach at one service does not endanger any other. Modern managers sync across devices, autofill securely, and integrate with biometric unlocking.

What about two-factor authentication?

Always enable 2FA where available. Even the strongest password can be phished, but 2FA (via authenticator app or hardware key) adds a second factor an attacker cannot get by phishing alone. Prefer app-based (Google Authenticator, Authy) or hardware-based (YubiKey) 2FA over SMS, which is vulnerable to SIM-swap attacks.

Password Generator

Utility

Generate strong random passwords with customizable length and character sets.

Utility

Password Generator

Generated on April 24, 2026

Select at least one option

Length16

Uppercase (A-Z)Lowercase (a-z)Numbers (0-9)Symbols (!@#$)

?What is the Password Generator?

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 Formula

Password = sequence of random characters drawn uniformly from the chosen sets, using crypto.getRandomValues (a cryptographically secure pseudo-random number generator).

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.

Practical Examples

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.

Frequently Asked Questions

With all four character classes (uppercase, lowercase, digits, symbols — 94 possible characters), a 16-character password has roughly 94^16 = 3.7 × 10^31 combinations. Even an attacker with a trillion guesses per second would need more than the age of the universe to brute-force it. This is considered uncrackable by any currently known technology.

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Password Generator

Password Generator

?What is the Password Generator?

The Formula

Practical Examples

Frequently Asked Questions

How strong is a 16-character password?

Is this generator truly secure?

Does this tool save or transmit generated passwords?

What password length should I use?

Should I include symbols in my passwords?

Can I memorize generated passwords?

Why are password managers better than memorizing passwords?

What about two-factor authentication?

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