Free Strong Password Generator
Generate cryptographically secure random passwords. Nothing is transmitted — passwords are created and stay in your browser.
Why length beats complexity rules
A password's real strength — its entropy — is roughly the character-set size raised to the power of its length. Every additional character multiplies the number of possible passwords by the full size of the character pool; every additional required character type (say, forcing at least one symbol) only adds a small, one-time boost. That's why a 20-character password using only letters and digits is typically far stronger than a 10-character password stuffed with every symbol rule a site can demand — length dominates the math. It's also why arbitrary complexity rules ("must contain a symbol, a number, and no more than two repeated letters") often make passwords harder for people to remember without meaningfully improving their actual strength.
The bigger risk isn't a weak password
Even a genuinely strong, long password loses all of its protection the moment it's reused across multiple accounts — a single breached, unrelated site is enough to compromise every other account using the same password. Generating a unique password per site (which this tool makes painless) and storing them in a password manager closes that gap in a way that no amount of individual password strength can.
Frequently Asked Questions
How random are these passwords?
They are generated with your browser's Web Crypto API (crypto.getRandomValues), the same cryptographically secure random source used for encryption keys — not the weaker Math.random(). Every generated password also includes at least one character from each type you select.
How long should my password be?
16 characters with all character types gives roughly 100 bits of entropy — far beyond what any current attacker can brute-force. Use 20+ for anything critical, and never reuse passwords across sites; a password manager makes that painless.
Why does length matter more than adding symbol/number requirements?
Entropy scales with the character pool size raised to the power of the length — each additional character multiplies the possibilities, while requiring one more character type only adds a small fixed boost. A longer password with a simple character set often beats a shorter one stuffed with complexity rules.
Is it safe to reuse one strong password across multiple sites?
No — no matter how strong the password itself is, reusing it means a single breach at any one site exposes every other account using it. Unique passwords per site, kept in a password manager, protect against that in a way that password strength alone never can.
Are the generated passwords sent to a server or stored?
No. Generation happens entirely in your browser's memory. Nothing is transmitted, logged, or saved — refresh the page and the password is gone forever.
What does "exclude look-alikes" do?
It removes characters that are easy to confuse when reading or typing a password by hand: 0 and O, 1, l and I. Useful for passwords someone might need to type from a screen or paper.