Password Strength Checker - Test Password Strength Free Online

About This Tool

The Password Strength Checker tells you in real time how resistant a password is to guessing and brute-force attacks. It analyzes length, character variety, entropy, and common weak patterns, then estimates how long the password would take to crack. Everything runs locally in your browser, so the password you test is never sent anywhere, stored, or logged.

Key Features

• Instant strength score from 0 to 100 with a clear label from Very Weak to Very Strong
• Entropy measurement in bits, a standard gauge of password unpredictability
• Estimated crack time, from instantly to longer than the universe has existed
• Detection of common passwords, keyboard sequences, and repeated characters
• Specific tips to strengthen the exact password you typed
• Show and hide toggle plus one-click clear for safe testing on shared screens
• 100 percent client-side: nothing leaves your browser

How to Use

1. Type the password you want to test into the input box.
2. Read the strength score, entropy, and estimated crack time instantly.
3. Follow the tailored tips to improve weak spots.
4. If the password is weak, generate a strong replacement with the linked Password Generator.