Is my password stored or sent anywhere?

No. All password analysis happens entirely in your browser using JavaScript. Your password never leaves your device and is not sent to any server.

What do the crack time estimates mean?

The tool estimates how long it would take to crack your password under different scenarios: online attacks (limited attempts), offline attacks (unlimited attempts), and attacks using specialized hardware. A strong password should resist offline attacks for centuries.

Why is my long password rated as weak?

Length alone doesn't guarantee strength. Passwords containing dictionary words, repeated characters, keyboard patterns, or predictable substitutions (p@ssw0rd) are easily cracked despite being long. The analyzer detects these patterns.

What makes a strong password?

Strong passwords are long (12+ characters), use a mix of uppercase, lowercase, numbers, and symbols, avoid dictionary words and personal information, and are unique for each account. Consider using a passphrase—a random sequence of words.

Password Strength Analyzer

Free password strength checker that analyzes your passwords in real-time. Get detailed feedback on security vulnerabilities, crack time estimates, and actionable suggestions to create stronger passwords—all processed locally in your browser.

How to Use This Password Strength Analyzer

1Type or paste your password in the input field
2View the real-time strength meter and score (0-4)
3Read the detailed feedback and suggestions for improvement
4Check the estimated crack times for different attack scenarios
5Apply suggestions to create a stronger password

Features

✓Real-time strength analysis
✓0-4 strength score with visual meter
✓Crack time estimates for various attack types
✓Pattern detection (common words, dates, sequences)
✓Actionable improvement suggestions
✓100% client-side processing (password never leaves your device)
✓Based on zxcvbn algorithm (used by Dropbox)

How Password Strength is Measured

Password strength is determined by entropy—the unpredictability of a password. Strong passwords resist attacks like brute force (trying all combinations), dictionary attacks (common words), and pattern-based attacks (keyboard patterns, dates). This tool uses the zxcvbn algorithm, which models real-world password cracking by detecting common patterns, substitutions (like @ for a), and leaked password databases.