Free online password strength checker that analyzes your passwords for security vulnerabilities. Get instant feedback, estimated cracking time, entropy bits, and personalized recommendations for stronger, more secure passwords. 100% secure - all processing happens in your browser.
Our Password Strength Checker helps you evaluate the security of your passwords in real-time. Discover how long it would take to crack your password, analyze entropy bits, and get actionable tips to create stronger, more secure passwords for all your online accounts. Whether you're checking a new password or verifying existing ones, our tool provides comprehensive security analysis.
Type or paste your password in the secure input field (100% private, never transmitted)
Our algorithm instantly analyzes password strength, complexity, and patterns
Receive a detailed security score (0-100%) with entropy and cracking time estimates
Get personalized tips to create stronger passwords or generate a secure one instantly
12+ characters are exponentially harder to crack than 8 characters. Each additional character multiplies complexity.
Mix uppercase, lowercase, numbers, and special characters to maximize entropy and resistance to brute force.
Don't use sequential numbers (1234), keyboard patterns (qwerty), or personal information (birthdays, names).
Use completely different passwords for each account. Never reuse passwords across multiple services.
Higher entropy means more randomness. Aim for 60+ bits for strong security against modern cracking hardware.
Security Guarantee: Your password is processed locally in your browser and never sent to any server. We never see, store, or transmit your password. 100% private and secure.
Your password is analyzed locally - never transmitted or stored
Start typing a password to get personalized security recommendations
Absolutely! Our password strength checker works entirely in your browser using JavaScript. Your password is never sent over the internet, never stored on any server, and never leaves your device. All analysis happens locally for maximum privacy and security.
A secure password should be: 12+ characters long (longer is exponentially better), include a mix of uppercase and lowercase letters, numbers, and special characters, avoid common words, patterns, or personal information, and be unique for every account. Aim for 60+ bits of entropy for strong security.
We estimate cracking time based on password entropy and assume a powerful attacker with modern hardware making 1 billion guesses per second. This is a conservative estimate - actual times may vary based on the attacker's resources and password hashing algorithms used.
Entropy measures the randomness and unpredictability of your password, expressed in bits. Each bit doubles the difficulty of guessing. A password with 40 bits of entropy is roughly 1 trillion times harder to crack than one with 20 bits. We recommend 60+ bits for strong security.
Yes! Password managers like LastPass, 1Password, Bitwarden, or Apple's iCloud Keychain help generate and store strong, unique passwords for all your accounts securely. You only need to remember one master password, and the manager handles the rest.
For most accounts, change passwords every 90 days. For critical accounts (email, banking, social media), consider changing every 60 days. Change immediately if you suspect any compromise or after a data breach notification.
2FA adds an extra security layer by requiring a second verification method (like a phone code, authenticator app, or hardware key) in addition to your password. Always enable 2FA when available - it prevents 99.9% of account takeover attacks.
No. Simple substitutions like "p@ssw0rd" (using @ for a, 0 for o) are well-known to attackers and don't significantly improve security. Modern password crackers include these patterns in their dictionaries. Use completely random combinations instead.
Use passphrases: combine 4-5 random words with numbers and special characters (e.g., "Correct-Horse-Battery-Staple!2024"). These are long, secure, and easier to remember than random character strings.