🔐 Password Strength Calculator
entropy & crack time
Real‑time analysis · NIST guidelines · secure generator
Password
Very Weak
0 bits
Length
0
Charset
—
Lower
0
Upper
0
Digits
0
Symbols
0
Offline (1K/s)
—
GPU (1B/s)
—
Cluster (100B/s)
—
Entropy formula:
log₂(R
L
) →
R = 0, L = 0
NIST SP 800-63B
suggests ≥ 8 chars for memorized secrets, with at least one uppercase, lowercase, digit, and symbol. Avoid common patterns.
🔑 Secure Password Generator
Length
a–z
A–Z
0–9
!@#$%
Generate
📋 Copy
P@ssw0rd!XyZ9#2kL