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Security & Network

Password Strength Checker

Analyze password strength with entropy, pattern detection and crack time estimation

What is Password Strength Checker?

A password strength checker analyzes your password's security by calculating entropy (randomness in bits), detecting common patterns like keyboard walks and repeated characters, and estimating how long a brute-force attack would take. This tool runs entirely in your browser — your password is never sent to any server.

How to Use Password Strength Checker

  1. 1

    Enter your password

    Type or paste a password into the input field. Use the eye icon to toggle visibility.

  2. 2

    Review the score

    See your password strength score from 0-100 with a color-coded rating.

  3. 3

    Check crack time

    View estimated time to crack assuming 10 billion guesses per second.

  4. 4

    Fix issues

    Follow the improvement tips to strengthen your password.

Features

  • Real-time entropy calculation in bits
  • Pattern detection: keyboard walks, sequences, repeats
  • Common password database check
  • Crack time estimation (10B guesses/sec)
  • Character type breakdown
  • 100% client-side — password never leaves your browser

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Frequently Asked Questions

Is my password sent to your server?+
No. The analysis runs entirely in your browser using JavaScript. Your password never leaves your device.
What is a good password strength score?+
A score of 70+ is strong. For critical accounts (banking, email), aim for 90+. Use a password manager to generate and store strong passwords.
How is crack time calculated?+
We estimate brute-force time assuming 10 billion guesses per second, which models a powerful GPU-based offline attack against a fast hash like MD5.
Why does my long password score low?+
Length alone is not enough. Passwords with repeating patterns, common words, or limited character types score lower because attackers use dictionaries and pattern-based attacks.