Password Strength Checker

What is a Password Strength Checker?

A password strength checker is a security tool that analyzes your password and evaluates how secure it is against potential attacks. Our advanced checker examines multiple factors including length, character variety (uppercase, lowercase, numbers, special characters), entropy (randomness), common password patterns, sequential characters, and repeated characters. It provides real-time feedback with a visual strength meter, specific security recommendations, and a comprehensive requirements checklist. The tool helps you create stronger passwords by identifying weaknesses and suggesting improvements, all while keeping your password completely private in your browser.

How to Use the Password Strength Checker

Type or paste your password into the input field
Click the eye icon to toggle password visibility if needed
View the real-time strength meter (Very Weak to Very Strong)
Check the requirements checklist to see what's missing
Review the entropy score (higher is better)
Read the security suggestions to improve your password
Watch for common password warnings
Adjust your password based on feedback
Aim for "Strong" or "Very Strong" rating
Remember: Your password never leaves your browser

Key Features

6-Level Strength Meter

Visual strength indicator from Very Weak to Very Strong with color-coded progress bar.

Real-time Analysis

Instant feedback as you type with live strength updates and requirement tracking.

Entropy Calculation

Measures password randomness in bits - higher entropy means stronger security.

Common Password Detection

Warns about known weak passwords and common patterns that hackers try first.

Requirements Checklist

Visual tracking of password criteria - see exactly what's missing at a glance.

Security Suggestions

Actionable tips to improve password strength based on specific weaknesses detected.

Show/Hide Password Toggle

Optional password visibility control with eye icon for convenient viewing.

Privacy-First

All checking happens in your browser - password never sent to any server.

Pattern Detection

Identifies sequential characters (abc, 123) and repeated patterns for better security.

No Registration

Free to use without sign-up, downloads, or installations.

Common Use Cases

Account Creation

Test new passwords before setting them to ensure strong security from the start.

Security Audits

Evaluate existing password strength and identify weak passwords that need updating.

Password Updates

Ensure new passwords are stronger when changing credentials for better security.

Education

Learn what makes passwords secure and understand security best practices.

Compliance

Meet password policy requirements for organizational and regulatory standards.

Personal Security

Improve overall password hygiene and strengthen all your account credentials.

Why Choose Our Password Strength Checker?

✓Advanced algorithm analyzing multiple security factors
✓Real-time strength feedback as you type
✓Entropy calculation for true randomness measurement
✓Common password database to prevent weak choices
✓Pattern detection for sequential and repeated characters
✓Clear, actionable security recommendations
✓100% client-side processing - your password never leaves your browser
✓No data collection or storage
✓Works on all devices without installation
✓Completely free with no limitations

Frequently Asked Questions

Is it safe to enter my password here?

Yes! All password checking happens entirely in your browser. Your password is never sent to any server or stored anywhere. You can verify this in your browser's Network tab.

What makes a password strong?

A strong password has 12+ characters, mixes uppercase and lowercase letters, includes numbers and special characters, avoids common words, and doesn't have predictable patterns.

What is password entropy?

Entropy measures password randomness in bits. Higher entropy means more possible combinations, making the password harder to crack. 60+ bits is considered good, 80+ is excellent.

Why does my long password show as weak?

Length alone doesn't guarantee strength. If your password contains common words, patterns (like "12345"), or repeated characters, it's still vulnerable despite being long.

What are common passwords?

Common passwords are frequently used passwords like "password", "123456", "qwerty" that hackers try first. Our tool detects these patterns and warns you.

How often should I change my passwords?

Change passwords immediately if a service is breached. Otherwise, focus on using strong, unique passwords for each account rather than frequent changes of weak passwords.

Should I use a password manager?

Yes! Password managers can generate and store strong, unique passwords for all your accounts, making them much more secure than reusing passwords.

What's the minimum recommended password length?

We recommend at least 12 characters for good security, though 16+ characters is even better for sensitive accounts.

Password Security Tips

Try These Tools Too

PDF Merge

PDF Split

PDF Organize

Everything You Need to Know