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Analyze entropy, detect patterns, get time-to-crack estimates, and actionable improvement tips. Your password never leaves your browser.
Type a password above to analyze its strength
Your password never leaves your browser
Entropy math, pattern detection, and actionable tips — all running privately in your browser.
Calculates Shannon entropy in bits using the formula: length × log2(charset_size). Shows exact bits and the character set size that was detected.
Five-level visual strength meter: Very Weak, Weak, Fair, Strong, Very Strong. Color-coded from red to green with a smooth animated bar.
Estimates how long a brute-force attack at 10 billion hashes per second would take. Ranges from "less than a second" to "millions of years".
Detects which of the four character classes are present: uppercase letters, lowercase letters, digits, and symbols. Shows what is missing.
Detects common weak patterns: "password", "123456", "qwerty", keyboard walks, repeated characters, and other dictionary entries used by attackers.
Provides specific, actionable suggestions based on what the password is missing. Tells you exactly what to add to boost its strength significantly.
Entropy is calculated as: length × log2(charset_size). The charset size grows based on which character classes are used: lowercase (26), uppercase (26), digits (10), symbols (32). A 12-character password using all four classes has entropy ≈ 78.7 bits. Higher entropy means exponentially more guesses needed to crack it.
It estimates how long a brute-force attack would take at 10 billion hash checks per second — a realistic figure for a GPU cluster attacking a stolen hash database. This is a worst-case offline scenario. Real attacks may be faster (dictionary attacks) or slower (online rate-limiting). Use it to compare relative strength, not as an absolute guarantee.
Yes. All analysis happens entirely in your browser using JavaScript — nothing is sent to any server. There are zero network requests when you type. That said, as a general rule, avoid entering production passwords into any third-party tool. This tool is best for testing example passwords or understanding strength patterns.
Disclaimer: This tool is provided for informational and educational purposes only. Preview renderings are approximations and may differ from actual platform displays due to platform updates, caching, or rendering differences. We fetch publicly available metadata and do not store or share your URLs. Platforms may cache old data even after you update your content—use their official debug tools to refresh caches. ZIRA Software is not liable for any decisions made based on this tool's output.