Generate secure, cryptographically random passwords and Diceware passphrases in your browser with live entropy scoring and crack time estimates.
Password strength is quantified in bits of entropy, calculated as E = L × log2(R), where L is the length of the string and R is the size of the available character pool.
Can be cracked in seconds to hours with consumer graphics cards.
Requires months or years of dedicated cloud computing power.
Immune to brute-force cracking for trillions of years.
Common questions about this tool, calculation methods, and privacy.
Slifto uses window.crypto.getRandomValues(), the modern web standard for cryptographically secure pseudo-random number generation (CSPRNG). Unlike Math.random(), this API samples high-entropy hardware noise from your operating system, making generated keys resistant to brute-force prediction.
A passphrase consists of multiple real words strung together (e.g. "correct-horse-battery-staple"). Passphrases are much easier for humans to remember than random strings of characters, while maintaining astronomical mathematical entropy against computer cracking.
NIST (National Institute of Standards and Technology) emphasizes length over arbitrary character replacement rules. A 16+ character password with mixed entropy provides billions of years of protection against modern GPU hashcat cracking rigs.
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