Password Strength Checker
Enter any password to receive a detailed strength analysis: entropy calculation, character composition, pattern detection (keyboard walks, repeated characters, dictionary fragments, date patterns), and crack time estimates across four attack-speed scenarios.
Frequently Asked Questions
Does this tool send my password to a server?
No. All strength analysis runs entirely in your browser. Your password never leaves your device.
What factors determine password strength?
Entropy (length × character pool), breach patterns (keyboard walks, leet-speak, year suffixes), dictionary words, and repeated characters.
What is a good entropy score?
Below 50 bits is weak. 50–79 bits is fair. 80–99 bits is strong. 100+ bits is very strong and resistant to any realistic attack.
Why does adding a number to a common word barely improve the score?
Patterns like appending 1 or 123 to a word are among the first rules applied in modern cracking tools. The checker detects and weights these accordingly.