🔒 Password Strength Checker
Type a password to see its security rating.
**Time to Crack (Worst Case):** ---
Focus on length, randomness, and avoiding common words for a stronger password.
Thank you for using our **Password Strength Checker**! Always prioritize strong, unique passwords for maximum security.
🚀 How the Password Strength Checker Works
- **Input:** You type your password into the input field. The text is analyzed **in real-time** as you type.
- **Zxcvbn Algorithm:** The tool utilizes the **Zxcvbn** library, a powerful password strength estimator developed by Dropbox. This algorithm goes far beyond simple character counts.
- **Pattern Recognition:** Zxcvbn analyzes the password for common, easy-to-guess patterns, including:
- **Dictionary Words:** Names, places, and common phrases.
- **Sequential Patterns:** `123`, `abc`, `qwert`.
- **Repetitive Characters:** `aaaa`, `111`.
- **Common Leetspeak Substitutions:** `P@$$w0rd`.
- **Entropy Calculation:** The algorithm calculates the **password entropy** (measured in bits), which mathematically represents the level of randomness and complexity. Higher entropy means a stronger password.
- **Crack Time Estimation:** Finally, the tool estimates the time it would take a powerful, offline attacker to brute-force crack the password, providing a clear, real-world security metric (e.g., "3 days," "millennia"). **The entire process is client-side.**
❓ Frequently Asked Questions
1. How is the "Time to Crack" calculated?
The tool estimates the number of guessing attempts required (entropy) and divides that by a theoretical maximum guess rate for an attacker (e.g., 100 billion guesses per second). This gives a **worst-case scenario** time to crack the password via brute force.
2. Is my password safe while I'm typing it?
Yes, absolutely. The strength checking is performed **100% client-side** using a JavaScript library running inside your web browser. Your password text is **never transmitted** over the internet or recorded by our servers, ensuring your privacy.
3. Why is "password123" weaker than "correct horse battery staple"?
The checker recognizes `password123` as a common dictionary phrase and sequential pattern. The second phrase, while containing simple words, is **long and random** in its construction, dramatically increasing the search space an attacker must check. **Length** is the most critical factor.
4. What is the recommended minimum strength?
Security experts generally recommend passwords that take at least **several years** to crack, and ideally, **thousands of years**. This usually corresponds to a length of 12-16 characters that includes a mix of upper/lowercase letters, numbers, and symbols, or a **long passphrase**.
5. Can I use the checker to verify non-English words?
The Zxcvbn library's core dictionary is primarily English-based. While it excels at common English words and patterns, its ability to detect common non-English words is limited. For maximum security, always avoid words, regardless of language.