Password Strength Checker - Check Password Security Online
Check your password strength online for free. Get instant feedback on length, complexity, and estimated crack time. No password is stored or sent anywhere.
Enter a password to check its strength.
What is Password Strength Checker?
Password Strength Checker analyzes your password and gives instant feedback on its security. It checks length, character variety, and common patterns, then estimates how long it would take to crack. Your password is never sent to any server — all analysis happens in your browser.
How to Check Password Strength
- Type or paste your password into the input field
- View the strength rating and color indicator
- Check which security criteria are met
- Follow the tips to improve weak passwords
Password Checker Features
- Real-time strength rating (Very Weak to Very Strong)
- Estimated crack time based on entropy
- Checks for length, uppercase, lowercase, numbers, and symbols
- Detects common passwords
- 100% client-side — password never leaves your browser
Password Checker FAQ
Is my password stored or sent anywhere?
No. All analysis happens entirely in your browser using JavaScript. Your password is never transmitted to any server.
What makes a strong password?
A strong password is at least 12 characters long and includes a mix of uppercase letters, lowercase letters, numbers, and symbols. Avoid dictionary words and common patterns.
How is crack time estimated?
Crack time is estimated based on the password's entropy (number of possible combinations) assuming a fast offline attack of 10 billion guesses per second.