Test Your Password Security
Think your password is secure because it has an exclamation point at the end? Think again. Our Password Strength Checker analyzes your password's entropy, pattern predictability, and estimated crack time without ever sending your keystrokes to a server.
How Hackers Actually Crack Passwords
Understanding how your password will be attacked helps you build better ones:
- Dictionary Attacks Hackers load millions of common words and phrases. If your password is "Batman2023!", it will be cracked in milliseconds.
- Brute-Force Trying every possible combination of characters (aaaa, aaab, aaac). This is why length is the most important factor in security.
- Credential Stuffing Using lists of passwords exposed in previous corporate data breaches to log into other websites.
- Pattern Guessing Keyboard walks like "qwerty" or "asdfg" are instantly recognized by cracking software.
How to Use This Tool
- Upload or Input Data: Select your file or paste your data directly into the tool interface. Everything remains on your device.
- Configure & Process: Adjust any optional settings if necessary. The tool will process your data instantly inside your browser.
- Download Result: Preview the output and click the download or copy button to save your final results.
Frequently Asked Questions
Are you saving my password?
Absolutely not. The analysis logic (typically powered by the zxcvbn library) runs 100% locally in your web browser. You can even disconnect from Wi-Fi and test it.
Why does it say my long password is weak?
If your password consists of a very common phrase, a sequence (123456), or repeating characters (aaaaaa), the algorithm recognizes it as highly predictable, regardless of length.
What makes a 'Strong' password?
A strong password usually relies on high entropy—meaning it is a long, completely random string of characters, ideally generated and stored by a password manager.