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Password Strength Checker

Instantly evaluate password entropy against real-world dictionary attacks.

Whenever possible, your data never leaves your device. Your security is our priority.
Security RatingNone

About this Tool

The UseMil Password Strength Checker utilizes zxcvbn, an advanced open-source algorithm originally developed by Dropbox. Instead of just looking for symbols and numbers, it acts like a real hacker would.

It cross-references your input against massive dictionaries of common passwords, names, television shows, and keyboard patterns (like "qwerty"). This provides a highly accurate "Time to Crack" estimation based on modern brute-force hardware.

Entering your actual passwords into online forms is inherently dangerous. Because this tool operates entirely within your browser using JavaScript, your password data never leaves your device, ensuring complete privacy while you audit your security.

How to Use

1

Type your Password

Enter the password or passphrase you want to test into the secure input field.

2

Review the Crack Time

Look at the estimated time it would take a computer to guess your password. Aim for centuries, not seconds.

3

Read the Feedback

If your password is weak, the algorithm will provide specific warnings (like 'Avoid repeated words') and actionable suggestions to improve it.

Frequently Asked Questions

Yes. This tool is built specifically to never transmit data. There are no API calls or database connections—everything is evaluated locally on your own CPU.
If your password is long but consists of common words (like 'correcthorsebatterystaple' or 'admin123456789'), the dictionary algorithm recognizes it. Hackers use these same dictionaries, so common patterns are instantly cracked regardless of length.
The algorithm calculates time based on a slow offline hashing scenario (like bcrypt or PBKDF2) at roughly 10,000 guesses per second. If the database was breached without these protections, the real crack time would be significantly faster.