How Strong Is My Password? Free Password Strength Checker
Test your password strength instantly. See how long it would take to crack, get a security rating, and learn how to make your passwords stronger.
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How Strong Is My Password?
Password strength measures how resistant your password is to being guessed or cracked by attackers. A strong password combines length, character variety, and unpredictability to create billions or trillions of possible combinations that attackers must try.
The main factors that determine password strength are:
- Length β Each additional character exponentially increases the number of possible combinations
- Character diversity β Using uppercase, lowercase, numbers, and symbols expands the character space
- Unpredictability β Avoiding common words, patterns, and personal information
- Uniqueness β Never reusing the same password across multiple accounts
Use the password strength checker above to test how strong your password is and get an instant security rating.
Password Strength Meter: How It Works
Our password strength meter analyses your password in real time and rates it on a four-level scale. The meter checks for character types (lowercase, uppercase, numbers, symbols) and password length to calculate an overall strength score.
| Rating |
Score |
What It Means |
| Weak | 0-25% | Easily cracked in seconds β uses too few character types or is too short |
| Moderate | 26-50% | Some protection but vulnerable to targeted attacks β add more character types or length |
| Strong | 51-75% | Good security for most accounts β uses multiple character types and decent length |
| Very Strong | 76-100% | Excellent security β long password with full character diversity, would take years to crack |
How Long Would It Take to Crack My Password?
The time it takes to crack a password depends on its length, the character set used, and the attacker's computing power. Our crack time estimator assumes an attacker can make 10 billion guesses per second, which reflects modern GPU-based brute-force attacks.
The formula is: Character SpaceLength ÷ Guesses Per Second = Time to Crack. A password using only lowercase letters has a character space of 26, while one using all character types has a space of 94.
| Password Type |
Example |
Character Space |
Estimated Crack Time |
| 6 lowercase letters | abcdef | 26 | Instantly |
| 8 lowercase letters | password | 26 | ~21 seconds |
| 8 mixed characters | Pa5sw0rd | 62 | ~3.5 minutes |
| 10 mixed + symbols | P@s5w0rd!x | 94 | ~17 days |
| 12 mixed + symbols | P@s5w0rd!x#2 | 94 | ~475 years |
| 16 mixed + symbols | Xk9!mP@2vL#nQ8&w | 94 | ~Millions of years |
Try the password strength tester above to see the estimated crack time for your own password.
How to Test Your Password Strength
Testing your password strength is quick and private. Our password security checker runs entirely in your browser β your password is never sent to any server or stored anywhere.
- Enter your password β Type or paste your password into the input field above
- View the strength rating β The meter instantly shows Weak, Moderate, Strong, or Very Strong
- Check the crack time β See how long a brute-force attack would take to guess your password
- Improve if needed β Add more length, character types, or complexity until you reach Strong or Very Strong
Your password never leaves your device. The strength analysis uses client-side JavaScript, so you can test passwords for your most sensitive accounts with confidence.
What Makes a Password Strong?
A strong password is one that would take an attacker thousands of years to crack, even with powerful hardware. Here are the key factors:
- Length (12+ characters) β Each extra character makes your password exponentially harder to crack. Aim for at least 12 characters, ideally 16 or more
- Character diversity β Use all four types: uppercase (A-Z), lowercase (a-z), numbers (0-9), and symbols (!@#$%^&*). This increases the character space from 26 to 94
- Unpredictability β Avoid dictionary words, names, dates, and keyboard patterns (like "qwerty" or "123456"). Randomness is key
- Uniqueness β Never reuse passwords across accounts. If one account is breached, all accounts sharing that password are compromised
Need help creating a strong password? Try our Random Password Generator to create one instantly.
Most Common Passwords to Avoid
These are the most common passwords found in database breaches. If you recognise any of yours, change them immediately:
| Password |
Times Breached |
Crack Time |
123456 | 23+ million | Instantly |
123456789 | 8+ million | Instantly |
password | 4+ million | Instantly |
qwerty | 3+ million | Instantly |
12345678 | 2+ million | Instantly |
abc123 | 2+ million | Instantly |
iloveyou | 1+ million | Instantly |
admin | 1+ million | Instantly |
All of these passwords share one thing in common β a complete lack of complexity. They use only lowercase letters or only numbers, contain common words, and are far too short. If you have accounts with passwords like these, use our password generator to create secure replacements.
How Hackers Crack Passwords
Understanding how hackers crack passwords helps you defend against them. Here are the most common attack methods:
- Brute-force attacks β Automated software tries every possible character combination. Short passwords with limited character types are cracked in seconds. Modern GPUs can test billions of combinations per second
- Dictionary attacks β Hackers use wordlists of common passwords, dictionary words, and known leaked passwords. Simple substitutions like "p@ssw0rd" are included in most wordlists
- Credential stuffing β When a website is breached, hackers take the leaked usernames and passwords and try them on other websites. This is why reusing passwords across accounts is so dangerous
- Rainbow table attacks β Precomputed tables of password hashes allow attackers to look up passwords almost instantly, bypassing the need for real-time computation
- Social engineering β Attackers research personal information (birthdays, pet names, favourite teams) to guess passwords based on personal details
The best defence is a long, random password that uses all character types. Test your password to see if it can withstand these attacks.
Password Security Best Practices
A strong password is the foundation of online security, but it's not the only step. Follow these best practices to protect your accounts:
- Use a password manager β Store all your passwords in an encrypted vault so you only need to remember one master password. This lets you use unique, complex passwords for every account
- Enable two-factor authentication (2FA) β Add a second layer of security so that even if your password is compromised, your account stays protected
- Never reuse passwords β Use a different password for every account. If one is breached, the rest remain safe
- Use a VPN on public Wi-Fi β Public networks can expose your login credentials. A VPN encrypts your connection and keeps your passwords safe
- Check for breaches β Regularly check if your email or passwords have appeared in known data breaches and update compromised credentials immediately
Learn more about staying safe online in our guides on whether you should use a password manager, where to save passwords, and cyber awareness.
Frequently Asked Questions (FAQ)
Your password strength depends on its length, character variety, and unpredictability. A strong password is at least 12 characters long and includes uppercase letters, lowercase letters, numbers, and symbols. Use our free password strength checker above to test your password instantly and see its security rating.
Enter your password into the checker above to test its strength. The tool analyses your password's length, character types, and complexity to give you a rating from Weak to Very Strong. It also estimates how long it would take a hacker to crack your password using brute-force methods. Everything runs in your browser β your password is never sent to a server.
A password strength meter is a tool that evaluates how secure your password is by analysing factors like length, character diversity, and complexity. It provides a visual rating (such as Weak, Moderate, Strong, or Very Strong) to help you understand whether your password can resist brute-force attacks and dictionary attacks.
Crack time depends on your password's length and complexity. A 6-character lowercase password can be cracked instantly, while a 12-character password with mixed characters could take thousands of years. Our tool estimates crack time assuming 10 billion guesses per second, which reflects modern GPU-based attacks.
A secure password should score Strong or Very Strong on the strength meter and have an estimated crack time of at least thousands of years. If your password scores Weak or Moderate, you should make it longer, add more character types, and avoid common words or patterns.
Password complexity refers to the variety of character types used in a password. A complex password includes uppercase letters (A-Z), lowercase letters (a-z), numbers (0-9), and special symbols (!@#$%^&*). Higher complexity dramatically increases the number of possible combinations, making the password harder to crack.
You can trust password checkers that run entirely in your browser, like ours. Our tool uses client-side JavaScript, meaning your password is never transmitted to any server or stored anywhere. Always check that a password checker runs locally before entering a real password.
Hackers use several methods: brute-force attacks (trying every possible combination), dictionary attacks (using lists of common words and passwords), credential stuffing (using leaked passwords from data breaches), and rainbow table attacks (using precomputed hash lookups). Strong, unique passwords defend against all of these methods.
The best password strength checker analyses multiple factors including length, character variety, crack time estimation, and common pattern detection. Our free tool provides all of these features and runs entirely in your browser for maximum privacy. It gives you a clear strength rating and actionable suggestions to improve your password.
Enter your password in the checker above to rate it instantly. The tool rates passwords on a four-level scale: Weak (easily cracked), Moderate (some protection), Strong (good security), and Very Strong (excellent security). It also shows the estimated time to crack your password, giving you a clear picture of how secure it really is.
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