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Password Strength Checker

Check how strong your password is with real-time analysis. See entropy, estimated crack time, and get actionable tips to improve your password security.

  • Real-time analysis
  • Entropy calculation
  • Crack time estimation
  • 100% private & secure
Password Strength Enter a password
Entropy
-- bits
Estimated Crack Time
--

Security Criteria

At least 8 characters
At least 12 characters
Contains uppercase (A-Z)
Contains lowercase (a-z)
Contains numbers (0-9)
Contains special characters (!@#$%)

How It Works

1

Enter Password

Type or paste a password in the input field

2

Instant Analysis

The checker analyzes it against 6 security criteria

3

View Results

See your strength score, entropy, and crack time

4

Improve

Use the suggestions to strengthen your password

Why Use Our Password Strength Checker?

Real-time strength analysis

Get instant feedback as you type with our dynamic strength meter that updates on every keystroke.

Entropy calculation

See the exact entropy value in bits, measuring the true unpredictability of your password.

Estimated crack time

Understand how long it would take to crack your password with modern hardware at 10 billion guesses/second.

One-click strong password generator

Generate a secure 16-character random password instantly with a single click.

Visual criteria checklist

Track your progress with a live checklist showing which security criteria your password meets.

100% client-side

Your password never leaves your browser. All calculations happen locally for complete privacy.

Frequently Asked Questions

Yes. This tool is 100% client-side. Your password is never sent to any server, stored, or logged. All analysis happens locally in your browser.
A strong password is at least 12 characters long and includes a mix of uppercase letters, lowercase letters, numbers, and special characters. Avoid dictionary words or personal information.
Entropy measures the unpredictability of a password in bits. The higher the entropy, the harder the password is to guess. A password with 60+ bits of entropy is generally considered strong.
We assume an attacker can make 10 billion guesses per second (modern hardware). The estimate is based on the password's entropy using the formula: time = 2^entropy / 10,000,000,000.
Yes. Click "Generate Strong Password" to create a random 16-character password. Click the copy button to copy it, then paste it wherever you need it. We recommend saving it in a password manager.