Evaluate text keys against brute-force duration matrices and advanced security filters to test your exact password hacking protection levels.
Dudi Password Strength Analyzer is a powerful, 100% free online tool to test how strong your password really is. Using advanced algorithms, it evaluates your password against 8 security checks and calculates real entropy in bits, along with an estimated brute-force crack time assuming 10 billion guesses/second (modern GPU rig).
Unlike other password checkers, nothing is sent to any server — all analysis happens locally in your browser. Your password never leaves your device.
Our tool analyzes your password against 8 security criteria: length (8+ and 12+ characters), uppercase, lowercase, digits, symbols, no repeated characters, and no common sequences. It then calculates the true entropy in bits based on the character pool used, applies penalties for weak patterns, and estimates brute-force crack time assuming 10 billion guesses per second.
Entropy measures the randomness of a password in bits. Higher entropy = harder to crack. A password with 40 bits is weak, 60-80 bits is strong, and 100+ bits is virtually uncrackable with current technology. Our tool shows your exact entropy so you can see precisely how secure your password is.
Crack time = 2^entropy ÷ guesses/second. We assume a modern GPU rig cracking 10 billion passwords per second (realistic for offline attacks on weak hashes). Online attacks (over the internet) are much slower — typically 100-1000 guesses/second — so your real-world safety is often higher.
Common weaknesses: less than 8 characters, only lowercase letters, dictionary words, predictable patterns (123, abc, qwerty), personal info (name, birthday), repeated characters (aaa, 111), or a password used on multiple sites. Even adding one symbol or digit exponentially increases strength.
Yes — 100% safe! This tool runs entirely in your browser using JavaScript. Your password is never transmitted, stored, logged, or shared. There's no server, no database, no analytics. You can even use this tool offline (after first page load).
Never! Always use a unique password for every important account. If one site is breached, your other accounts remain safe. Use a password manager (Bitwarden, 1Password, KeePass) to generate and store unique passwords. Test them here to verify strength.
Yes, 100% free with no hidden charges, no subscription, no signup, no watermarks, and unlimited checks. Test as many passwords as you want, anytime.
Yes! Dudi Password Strength Analyzer is fully responsive and works on smartphones, tablets, laptops, and desktops. You can test passwords on Android, iOS, Windows, macOS, and Linux — all you need is a modern web browser.