Password Strength Checker
Check how strong your password is. Analyze entropy, estimated crack time, and get improvement suggestions.
About This Tool
Check how strong your password is. Analyze entropy, estimated crack time, and get improvement suggestions. All operations are performed entirely in your browser for maximum security. No data is ever sent to any server.
Security Notice: This tool uses
crypto.getRandomValues(), a cryptographically secure random number generator built into your browser.
Frequently Asked Questions
Is my password sent to a server?
No. All analysis happens entirely in your browser. Your password never leaves your device.
What is entropy?
Entropy measures the randomness of a password in bits. Higher entropy means a more secure password. 80+ bits is considered very strong.