Evaluate password strength, calculate Shannon entropy in bits, estimate brute-force cracking time, and detect common dictionary vulnerabilities.
Calculates estimated brute-force cracking duration across fast GPU clusters (100 Billion guesses/sec) and supercomputers.
Measures mathematical information entropy to determine true cryptographic resilience.
Detects keyboard walks (qwerty), sequential dates (1990), dictionary words, and common substitutions (p@ssw0rd).
Test passwords safely in your browser; zero keystrokes or password strings ever leave your device.
The Password Strength Checker evaluates candidate passwords using pattern matching algorithms inspired by zxcvbn.
It tests for spatial keyboard patterns, repeated characters, date sequences, l33t speak substitutions, and dictionary words, calculating the minimal brute-force search space.
All calculations run strictly inside your local browser memory with zero network requests.
Check if your current passwords can be cracked in seconds by modern automated cracking tools.
Verify whether a proposed password policy meets NIST Special Publication 800-63B standards.
Demonstrate how adding 4 random characters increases cracking time from seconds to centuries.
Ensure your password manager master password has at least 80+ bits of entropy.
Yes. Softnag operates 100% locally in your browser memory. No keystrokes, hashes, or text are ever transmitted over the network.
Cracking time is estimated by dividing the total mathematical search space by modern GPU cluster speeds (capable of 100 billion hash evaluations per second).
Under 40 bits is very weak (cracked in seconds); 40-60 bits is moderate; 60-80 bits is strong; 80+ bits is extremely strong (virtually uncrackable by modern computers).
Modern cracking tools use rule-based mutation dictionaries that test common l33t speak substitutions (like @ for a, 0 for o) in milliseconds.
This tool performs mathematical and structural entropy analysis locally without network queries to protect your privacy.
Yes! Softnag has zero server backends for this tool; all calculations are executed purely in your local browser JavaScript engine.
An entropy score of 60+ bits provides good security for everyday accounts, while 80+ bits is recommended for password managers and master keys.