Password Strength Checker & Analyzer
Test password security with length, complexity, and pattern analysis. Get a strength score and tips to improve. Nothing sent over the network.
Runs in your browser. No data leaves your device.
Frequently Asked Questions
How does the Password Strength Checker work?
Your password is analyzed locally using regex checks for character classes (uppercase, lowercase, digits, symbols), repeated characters, and sequential patterns like "abc" or "123". A composite score is built from length thresholds, character variety, and pattern absence. Entropy is computed as length times log2 of the detected character pool size, and crack time is estimated assuming 10 billion guesses per second.
Is it safe to type my real password into this tool?
Yes. The analysis runs entirely in your browser. Your password is never transmitted over the internet or stored anywhere. No network requests are made with your input.
What makes a password "strong"?
Length is the most important factor, followed by character variety (uppercase, lowercase, numbers, symbols) and avoiding common words or patterns. A random 16+ character password with mixed character types is considered strong.
How is the "time to crack" calculated?
It estimates how long a brute-force attack would take at a rate of billions of guesses per second. The calculation is based on the password's entropy -- the total number of possible combinations given its length and character set.