Password Strength Checker
Worried your password might be too weak to protect your accounts? Our Password Strength Checker gives you an instant, accurate assessment of any password's real-world security. It evaluates multiple critical factors — length, character diversity, common patterns, dictionary words, and keyboard sequences — to produce a comprehensive strength score. You also get an estimated crack time that shows exactly how long it would take an attacker to break your password using modern hardware. The entire analysis runs locally in your browser, so your password never touches a server. Whether you are creating a new password, auditing existing ones, or setting organizational security policies, this tool provides clear, actionable feedback to help you make smarter security decisions.
What Is
A password strength checker is a security analysis tool that evaluates how resistant a password is to guessing, brute-force, and dictionary attacks. Unlike simple length-based rules, modern password analyzers consider multiple dimensions of password entropy: total length, the mix of uppercase and lowercase letters, numbers, and special symbols, the absence of common dictionary words, the avoidance of predictable keyboard patterns like qwerty or 123456, and the exclusion of personal information such as names or birthdays. Our free online Password Strength Checker goes further by estimating real-world crack times based on current GPU cracking speeds, giving you a concrete sense of how your password would fare against an actual attack. It provides a detailed breakdown of every strength factor, suggestions for improvement, and a clear numerical score. Because all computation happens locally in your browser using JavaScript, your password is never transmitted over the internet — complete privacy is guaranteed. This makes it safe to use even for highly sensitive accounts where sending passwords to a third-party server would be unacceptable.
How to Use
- Type your password directly into the input field. Your input stays completely private and is processed only in your browser.
- Watch the strength meter update in real-time as you type, showing an instant visual rating from very weak to very strong.
- Review the detailed breakdown panel that explains exactly what makes your password strong or weak across multiple criteria.
- Read the personalized suggestions to improve your password, tailored to the specific weaknesses detected.
- Check the estimated crack time to understand how long it would take an attacker to break your password with modern hardware.
Examples
Input: Password: P@ssw0rd!
Process: Length:9, has upper/lower/digit/symbol, common? No → Score: 4/4
Result: Strong (4/4): 95 bits entropy, crack time ~3 years
Input: Password: 123456
Process: Length:6, digits only, common list? Yes → Score: 0/4
Result: Very Weak (0/4): common password, instant crack
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Frequently Asked Questions
What makes a strong password?
A strong password should be at least 12 to 16 characters long and include a mix of uppercase letters, lowercase letters, numbers, and special symbols. It should avoid common dictionary words, predictable sequences like 123456 or abcdef, keyboard patterns like qwerty, and personal information such as names, birthdays, or phone numbers. Ideally, use a random passphrase of four or more unrelated words, or let a password manager generate a truly random string for maximum entropy.
Is my password stored or transmitted anywhere?
No. All password analysis is performed entirely within your browser using JavaScript. Your password is never sent to any server, stored in a database, or logged in any way. You can verify this by checking your browser's network tab — no requests are made while using the tool. This local-first approach means even highly sensitive passwords can be checked safely without any privacy risk.
What is a brute-force attack?
A brute-force attack is a method where an attacker systematically tries every possible combination of characters until the correct password is found. The time required grows exponentially with password length and character variety. For example, an 8-character password using only lowercase letters can be cracked in seconds, while a 16-character password with mixed characters could take billions of years. Modern GPUs can attempt billions of combinations per second, making length and complexity critical.
Should I use a password manager?
Yes, a password manager is one of the best tools for maintaining strong security across all your accounts. Password managers can generate truly random, highly complex passwords for every site you use, store them securely in an encrypted vault, and auto-fill them when needed. You only need to remember one strong master password. This eliminates the risky practice of reusing passwords across multiple sites, which is a leading cause of account breaches.
What are the most common weak passwords?
The most commonly used weak passwords include strings like 123456, password, qwerty, abc123, 111111, admin, letmein, welcome, monkey, and dragon. These passwords can be cracked almost instantly because they appear in every attacker's dictionary list. Avoid any password that follows a simple pattern, uses personal information, or appears on known compromised password lists. If your password resembles any of these examples, change it immediately.