Password Strength Analyzer
Description
Analyze password strength in real-time: entropy, crack time estimate, common pattern detection, and breach checks.
About Password Strength Analyzer
This analyzer estimates how strong a password is by calculating its entropy and projecting an approximate time to crack it, while flagging common patterns and weaknesses. Because everything runs locally in your browser, the password you type is never sent to a server, so you can evaluate sensitive credentials safely. The results are estimates meant to guide you toward longer, more random, less predictable passwords.
How to use
- Type or paste the password you want to evaluate into the input field.
- Review the real-time entropy and estimated crack time.
- Check the warnings for common patterns or weaknesses that were detected.
- Adjust the password by adding length and randomness, then re-check until it scores well.
Frequently asked questions
Is my password sent anywhere when I analyze it?
No. The analysis runs entirely client-side in your browser, so the password you enter is never uploaded or transmitted.
What is password entropy?
Entropy, measured in bits, estimates how unpredictable a password is. More bits means more possible combinations an attacker would have to try, so higher entropy generally means a stronger password.
How accurate is the crack-time estimate?
It is an approximation based on assumptions about attacker speed and the password's structure. Real-world results vary with hardware and the defenses in place, so treat it as guidance rather than a guarantee.
Why does it warn about common patterns?
Predictable elements such as dictionary words, repeated characters, and keyboard sequences are easy for attackers to guess, so they reduce effective strength even if the password looks long.