Secure Password Generator
Generate secure passwords with real entropy calculation. Client-side only. No data stored.
This secure random password generator creates strong passwords and passphrases using cryptographically secure randomness. Free online password generator with real entropy calculation.
Estimated crack time: -
Entropy Comparison
- 40 bits → Weak
- 60 bits → Moderate
- 80 bits → Recommended minimum
- 100+ bits → Enterprise-grade security
Security Standards Reference
Modern recommendations follow NIST SP 800-63B guidelines, emphasizing password length and resistance against brute-force attacks. Passwords with 80+ bits of entropy are considered highly secure.
Read more in our guide on password entropy explained or learn how secure your password really is.
What Makes a Password Strong?
A strong password is long, random, and generated using a secure random source. The most important factors are length and entropy — not complexity tricks.
1. Length Matters Most
Every additional character increases entropy exponentially. A 16-character random password is dramatically stronger than an 8-character one.
2. True Randomness
Secure passwords must be generated using a cryptographically secure random number generator
such as window.crypto.getRandomValues().
3. High Entropy (80+ Bits Recommended)
Security professionals and NIST guidelines recommend aiming for at least 80 bits of entropy for strong long-term protection.
Want to learn more? Read our detailed guide: password entropy explained.
FAQ
What is password entropy?
Password entropy measures how unpredictable a password is in bits.
How many bits of entropy should a password have?
Security experts recommend at least 80 bits of entropy for strong password protection.
Is this generator safe?
Yes. It runs entirely in your browser using secure random generation.
What is better: password or passphrase?
Both can be secure if generated randomly. Passphrases are easier to remember while long random passwords provide maximum entropy.
