Secure Password & Passphrase Generator
Create highly secure, cryptographically random passwords or memorable passphrases in your browser. Calculate entropy and strength metrics locally.
Privacy Compliance: Agnixbit is 100% serverless and local-first. All password and passphrase generation calculations are performed client-side inside your browser in-memory. None of your options, parameters, word lists, or generated credentials are ever uploaded or transmitted to any remote servers.
Frequently Asked Questions
Is my generated password safe and private?
Yes. The Password Generator operates 100% locally in your browser. All generation is done client-side using JavaScript's secure random number API (crypto.getRandomValues()). No text inputs, options, or generated passwords are ever sent to any remote server or stored anywhere outside your browser.
What makes a strong password?
A strong password should be at least 12–16 characters long and combine uppercase letters, lowercase letters, numbers, and symbols. Avoiding dictionary words, names, dates, or repetitive patterns also significantly increases security. Alternatively, using a multi-word passphrase is highly effective.
What is the difference between a password and a passphrase?
A standard password is a random string of mixed characters, which is hard for humans to remember but very hard for computers to guess if long enough. A passphrase consists of several random words joined by a separator (e.g. correct-horse-battery-staple). Passphrases have high entropy (making them extremely secure) but are much easier for humans to remember.
What is password entropy and how is it measured?
Entropy measures a password's unpredictability in bits. Higher entropy means the password is harder to crack. For a password, entropy is calculated as L * log2(P) where L is length and P is the character pool size. For passphrases, it is based on the number of random words chosen from a dictionary. A password with >60 bits of entropy is considered strong, and >80 bits is extremely secure.
How does this tool generate secure random numbers?
This tool uses the browser's native Web Cryptography API (window.crypto.getRandomValues()) instead of the standard Math.random(). The Web Cryptography API is cryptographically secure (CSPRNG), which means the numbers generated are statistically random and completely unpredictable, suitable for generating high-security keys and passwords.