Secure Password Generator

Generate strong passwords with entropy calculated in real time, 100% local and no transmission.

Cryptography
Miscellaneous Utilities
Free

About

Secure Password Generator

Generate cryptographically strong passwords using your browser's Web Crypto API. Customize the length, included character sets, and view the entropy calculated in real time to guarantee robustness against brute-force and dictionary attacks.

What it does

Adjustable length from 8 to 64 characters
Lowercase, uppercase, digits and special characters to choose from
At least one character from each selected set, option to exclude 0 and O
Entropy in bits and estimated cracking time
Generated with the Web Crypto API, one-click copy

Frequently asked questions

Which algorithm is used for generation?

Characters are drawn with the Web Crypto API (window.crypto.getRandomValues), which relies on the system's cryptographically secure random generator (CSPRNG), far safer than Math.random(). The result is then shuffled so the required characters are not placed first.

How is password strength measured?

The tool computes entropy in bits (E = L × log2(N), where N is the alphabet size and L the length) and derives a brute-force cracking time, assuming an attacker able to test one trillion combinations per second. Aim for at least 80 bits, and more for critical accounts.

Is the generated password sent anywhere?

No. Generation happens in your browser with no network transmission, and the password is not kept. Copy it straight into your password manager.

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