Accurate strength scoring
Uses entropy-based evaluation — not outdated rules.
Check Password Strength
Start typing to check strength...
How to Use This Password Checker
1
Enter password
Start typing any password you want to test.
2
Entropy calculation
The tool calculates bits of entropy using modern security math.
3
Strength rating
See instant feedback: Weak → Fair → Strong → Very Strong → Excellent.
4
Improve password
Add length, mix character sets, and avoid common patterns.
Benefits
Instant results
Strength updates live while typing.
Mobile-friendly
Optimized UI for all devices.
Secure & private
Everything runs locally in your browser — nothing is uploaded.
Frequently Asked Questions
We use entropy-based scoring, the modern industry standard. It measures the total bits of randomness in your password.
Entropy measures how hard it is for attackers to guess the password. Higher entropy = stronger passwords.
Yes. It follows Shannon entropy formula and strength thresholds used by companies like Google and Apple.
No. Everything runs locally in your browser and nothing is saved or uploaded.
A safe password should reach at least 60 bits of entropy. For maximum security, aim for 128+ bits.