UUID Generator
Generate single or bulk RFC 4122 Version 4 UUIDs using native crypto.randomUUID() with formatting options and TXT export.
Password Generator
Web CryptoGenerate cryptographically secure random passwords using crypto.getRandomValues() with length slider, character set toggles, and entropy strength meter.
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How to Use Password Generator
- 1Adjust the Password Length slider (from 6 to 64 characters; 16+ recommended).
- 2Toggle character sets: Uppercase (A–Z), Lowercase (a–z), Numbers (0–9), and Symbols (!@#$%^&*...).
- 3Review the generated password along with its estimated bit entropy and strength rating.
- 4Click 'Copy Password' to copy it to your clipboard or 'Regenerate' for a fresh password.
Key Features & Privacy
- ✦Powered strictly by `window.crypto.getRandomValues()` with rejection sampling to eliminate modulo bias — never uses `Math.random()`.
- ✦Guarantees inclusion of at least one character from every enabled character class before cryptographically shuffling.
- ✦Calculates real information entropy in bits (`L × log2(PoolSize)`) and displays a visual strength bar.
- ✦Zero storage: generated passwords are never written to localStorage, cookies, or network requests.
Frequently Asked Questions
Why does using `crypto.getRandomValues` matter instead of `Math.random`?
`Math.random()` uses a predictable pseudo-random algorithm not suitable for security. `window.crypto.getRandomValues()` taps directly into your operating system's cryptographically secure random number generator (CSPRNG).
Are generated passwords saved anywhere?
No. Passwords exist only in the text box on your screen and are wiped the moment you regenerate or close the tab.
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