Free password strength checker for better security.
Instantly analyze how strong your password is. See estimated crack times, entropy, character variety, and find weaknesses like common patterns, predictable sequences, or reused phrases.
Know the risks before attackers do
Many passwords look strong but fail simple security checks. This tool evaluates your password locally, showing its true strength and how quickly it might be cracked in different scenarios.
- Check entropy and estimated crack times.
- Find weak patterns like sequences or repeats.
- Detect common passwords and dictionary risks.
- Get actionable tips to instantly improve strength.
Privacy note: Passwords never leave your device. All analysis happens entirely inside your browser.
Check your password strength
Paste or type a password to see its estimated strength and potential weaknesses. We don't store or send what you enter, the check happens only in your browser.
Start typing a password to see the strength analysis.
For best security, use our password generator instead of hand-made passwords.
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Improve your passwords
Strength isn't just about length.
Even long passwords can be weak if they contain predictable structures. Here are key principles for creating safer, more resilient passwords.
Use unpredictability
Avoid common words, names, sports teams, or keyboard patterns. These are the first things attackers try in real-world breaches.
Longer is always better
12-16 characters is a baseline. Important accounts should use 20+ characters for real brute-force resistance.
Mix different character types
Combining lowercase, uppercase, numbers, and symbols expands the character pool and increases entropy dramatically.
Prefer generated passwords
The strongest passwords are random. Use a generator instead of trying to invent something clever—humans are too predictable.
FAQ
Password strength checker questions, answered.
Everything you need to know about how password strength is measured and what makes a password more secure.
What does “entropy” mean?
Entropy measures how unpredictable your password is. Higher entropy means more randomness and dramatically greater difficulty for brute-force attacks.
Can this tool see or store my password?
No — your password never leaves your device. We do not store, track, log, or transmit anything you enter.
Why is my long password still marked as weak?
Length alone isn’t enough. Common words, repeated characters, or predictable sequences can make even long passwords easy to guess.
How do I create a truly strong password?
Use random generation, include multiple character types, and store your passwords in a secure manager. Avoid anything personally meaningful or guessable.
Password Checker
Built for privacy and security
Every password you test stays on your device. Nothing is sent, logged, or stored — ever.
To generate a strong password instantly, try our password generator.