Password Strength Checker
/password-strengthAnalyze password strength with entropy scoring, character analysis, and tips to improve it.
Most password advice is vague — this checker shows you exactly how strong your password is. It scores entropy, analyzes character variety, and flags patterns like sequences or repeated characters. Practical suggestions show how to improve weak passwords. Analysis happens locally, so your password is never sent anywhere.
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FAQ
Frequently asked questions
Everything you need to know about password strength checker.
How is strength measured?
Entropy is calculated from the character set size and password length, then combined with pattern checks for common words and sequences.
What is entropy?
Entropy measures uncertainty in bits: each added character of a wider set adds more bits, and roughly 80 bits or more is considered strong for most uses.
What score scale is used?
Results are reported as weak, fair, good, or strong based on the computed entropy and pattern penalties, with a visual bar showing the level.
Does it flag common passwords?
Yes. Pattern checks penalize sequences like abc or 123 and repeated characters, pushing guessable passwords down to weak or fair.
Is my password stored?
No. Analysis runs locally in your browser and nothing is transmitted, so the password never leaves your device.
How can I improve my score?
Increase length, add mixed case, digits, and symbols, and avoid dictionary words and predictable sequences, which all raise the entropy estimate.
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