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Password Strength Checker
Your password is never sent to a server. Everything is calculated in your browser.
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Your password is never sent to any server — all analysis happens in your browser.
Type a password to check its strength
What does Password Strength Checker?
The password strength checker analyses entropy, charset size, estimated crack time and provides improvement tips — all locally in the browser.
How to use Password Strength Checker?
- Type your password in the input field.
- The strength meter updates instantly as you type.
- Read the tips and improve your password as needed.
Key features
- Entropy calculation in bits based on charset size
- Estimated crack time at 10 billion guesses/second
- Full privacy — password never leaves the browser
Frequently asked questions
How is entropy calculated?
Entropy = log₂(charset_size ^ length). The higher the entropy, the harder the password is to guess. Above 128 bits is considered very strong.
Is my password safe here?
Your password is never sent to any server. All analysis is done entirely in your browser.
Is this tool free?
Yes, this tool is completely free and requires no registration.
Is my data saved?
No. All calculations happen in your browser only — no data is sent to any server.