Password Entropy Visualizer
Visual breakdown of password strength — entropy bits, character sets, crack time estimates, and pattern warnings
You want to understand exactly how strong a password is — not just “weak” or “strong” but the actual entropy in bits, the character sets contributing to strength, and how long it would take to crack. This tool provides a detailed visual breakdown.
Understanding Entropy
Password entropy measures randomness in bits. The formula is: E = L x log2(R) where L is the password length and R is the size of the character set used.
| Entropy (bits) | Strength | Typical Crack Time (10B/sec) |
|---|---|---|
| < 28 | Very Weak | Seconds to minutes |
| 28 – 35 | Weak | Hours to days |
| 36 – 59 | Fair | Weeks to years |
| 60 – 79 | Strong | Centuries |
| 80+ | Very Strong | Heat death of universe |
Pattern Detection
Raw entropy assumes random characters. Real passwords often contain patterns that reduce effective entropy:
- Dictionary words: Common English words are tried first in attacks
- Keyboard patterns:
qwerty,asdf,zxcvsequences - Sequential characters:
abc,123,xyz - Repeated characters:
aaa,111 - Leet speak:
p@ssw0rdis easily reverse-mapped
When patterns are detected, the tool shows warnings alongside the entropy calculation.
Frequently Asked Questions
How is this different from the Password Strength Checker? The Password Strength Checker gives a quick pass/fail assessment. The Entropy Visualizer provides a detailed mathematical breakdown with visual charts showing exactly where your password’s strength comes from.
Is my password sent to a server? No. All analysis runs in your browser using JavaScript. Your password never leaves your device.
What attack speed does the crack time estimate assume? Two scenarios are shown: 10 billion guesses/second (high-end GPU cluster) and 1 trillion guesses/second (theoretical near-future capability).