Password Strength Analyzer
Evaluate password complexity, estimate crack times, and identify vulnerabilities locally in your browser.
Composition Checklist
- At least 8 characters
- Contains uppercase letter (A-Z)
- Contains lowercase letter (a-z)
- Contains number (0-9)
- Contains special character (!@#$)
Security Warnings & Feedback
How Do We Measure Password Strength?
Unlike standard validators that only check if you included a number or a symbol, the OnlinePaste Password Analyzer uses Dropbox's open-source zxcvbn algorithm. This engine performs pattern matching against thousands of common dictionary words, names, leaked passwords, keyboard spatial patterns (like qwerty), and repeated characters to calculate true entropy.
Time to Crack Estimation
The "Time to Crack" metric calculates how long it would take a modern offline hashing cluster (capable of billions of guesses per second) to brute-force your password. If your password is just 8 lowercase letters, it can be cracked instantly. Adding length and mixing character types increases the mathematical complexity exponentially, pushing crack times from seconds to centuries.
Why is Client-Side Checking Crucial?
Never type your actual passwords into online tools that transmit data back to a server. This analyzer downloads the testing algorithm into your browser's local memory. When you type, the calculations happen entirely on your own device. The data is destroyed the moment you close the tab or click "Clear".