Generate strong, cryptographically secure random passwords instantly. Customize length and character sets. Never leaves your browser.
Unlike most online password generators that use Math.random(), our generator uses the Web Cryptography API's crypto.getRandomValues() function — the same cryptographic-grade randomness used by security software. This means your passwords are truly unpredictable. All generation happens locally in your browser; no password is ever transmitted to our servers. Use it to generate strong passwords for email, banking, social media, and any account that needs protection.
Most random number generators — including JavaScript's Math.random() — are pseudo-random: fast and statistically uniform, but ultimately deterministic and theoretically predictable given knowledge of the algorithm and its seed. For passwords, that predictability is a critical vulnerability. This generator instead uses the Web Cryptography API's crypto.getRandomValues()function, which draws entropy from the operating system's hardware-level random number generator — the same source used by security software, VPNs, and TLS certificate generation. The output is genuinely unpredictable, even to someone with full access to the browser's source code.
Password strength is measured in entropy bits: the number of bits required to represent every possible password of a given length and character set, calculated as log2(charset_size ^ length). A 12-character password using only lowercase letters has approximately 56 bits of entropy. Adding uppercase, numbers, and symbols expands the character set from 26 to 95, raising the same 12-character password to approximately 79 bits — over 4 million times stronger. Length and character variety together determine how long a brute-force attack would take; at 80+ bits of entropy, that time exceeds the age of the observable universe with current hardware.
All generation runs locally in your browser with no server involvement. Generated passwords are displayed on screen and never transmitted over the network — the server hosting this site has no knowledge of any password you create here. There are no logs, no databases, and no server-side processing of any kind. Your password exists only on your screen, for only as long as you choose to keep it there.
A small business owner needs a new password for her accounting software. She opens the password generator, sets the length to 20 characters, and enables all four character sets: uppercase, lowercase, numbers, and symbols. The generator produces a password such as Xr7$mN2@qLpK9#vZ8!cA with approximately 130 bits of entropy. At that strength, a system attempting one billion guesses per second would take longer than the age of the observable universe to exhaust all possibilities through brute force.
She clicks Copy and pastes the password directly into her password manager — she never types it into a document, email, or chat. Because the password was generated fresh for this account and is stored only in her password manager, it is unique to this service. If the accounting software ever suffers a data breach, no other account of hers is at risk. This combination — long, random, unique per service, stored in a password manager — is the gold standard of modern password hygiene.
The bulk generation option is useful when setting up multiple accounts at once. A system administrator configuring 12 new service accounts can generate 12 unique passwords simultaneously, copy the batch output, and distribute them through an encrypted channel. Each password is generated with a completely independent call to crypto.getRandomValues(), so there is no statistical relationship between them that could be exploited to compromise multiple accounts from a single sample.
A strong password is long (at least 16 characters), uses a mix of uppercase letters, lowercase letters, numbers, and symbols, avoids common words or patterns, and is unique to each account. Our password generator creates strong passwords automatically — just set your desired length and character sets.
Password security comes from two factors: length and character set size. A 16-character password using all character types has 95^16 possible combinations — an astronomically large number. Our entropy calculator shows you exactly how strong your password is in bits.
Yes. Our password generator uses crypto.getRandomValues() — the browser's cryptographically secure random number generator — not Math.random(). All generation happens entirely in your browser. The password is never sent to any server.
For most accounts, 16 characters is a good minimum. For highly sensitive accounts (banking, email), use 20+ characters. Our generator defaults to 16 characters, which provides over 60 bits of entropy — considered Very Strong.
Entropy bits measure password strength mathematically. It represents log2(charset_size^length) — the number of bits needed to represent all possible passwords of that length and character set. More bits means more possible combinations and a stronger password. Under 28 bits is Weak; 60+ bits is Very Strong.