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What Makes a Strong Password?
A strong password should be long, unique, and hard to guess. Here are the key factors:
- Length: Longer is always better. Aim for at least 12 characters.
- Variety: Mix uppercase, lowercase, numbers, and symbols.
- Unpredictability: Avoid common words, names, dates, and patterns.
- Uniqueness: Use a different password for every account.
- Use a password manager: This is the best way to generate and store unique, strong passwords for every site.
Key Features
Everything you need, right at your fingertips. Simple, fast, and built for everyone.
0-100 Score
Get a numeric strength score so you know exactly how strong your password is.
Crack Time Estimate
See how long it would take a computer to brute-force your password.
Common Password Check
Instantly detects if your password is in known breach lists.
Actionable Tips
Specific suggestions for improving weak or mediocre passwords.
Length & Variety
Checks for length, uppercase, lowercase, numbers, and symbols.
Completely Private
All checking happens locally —your password is never sent anywhere.
How to Use This Password Strength Tester
Getting started is easy. Just follow these simple steps.
Type Your Password
Enter any password you want to test.
View Score
See strength rating, score bar, and crack time estimate.
Read Suggestions
Get specific tips to make your password stronger.
Improve & Retest
Follow suggestions and watch the score improve in real-time.
About This Password Strength Tester
Password strength testing is an important security practice that helps you evaluate how resistant a password is to guessing or brute-force attacks. A strong password is one of the simplest and most effective defenses against unauthorized access to your accounts.
Password strength depends on several factors: length (longer is exponentially better), complexity (mix of character types), unpredictability (no common words or patterns), and uniqueness (not reused across multiple accounts). A password strength tester analyzes these factors and gives you an estimate of how secure your password is.
Brute force attacks try every possible combination of characters until they find the right one. The time required grows exponentially with password length. An 8-character password with mixed characters might take hours to crack, while a 16-character password would take millions of years with current computing power.
Using a password strength tester helps you understand what makes a password strong and weak, and gives you actionable suggestions for improvement. Combined with a password manager and two-factor authentication, strong passwords are the foundation of good online security.
Password Strength FAQ
How long would it take to crack my password?
Crack time depends on length and character mix. An 8-character mixed-case password might take hours; a random 16-character passphrase can take millions of years with offline attacks. Use this tool’s crack-time estimate after you type a test password.
What makes a strong password?
Aim for 12+ characters, random words or a passphrase, unique per site, and avoid names, dates, or keyboard patterns. A password manager is the easiest way to stay unique everywhere.
Is a passphrase better than a complex password?
Yes, if it is long and not a common phrase. “Coffee-Truck-River-42” beats “P@ssw0rd1” because length and unpredictability matter more than symbol tricks. Four random words is a strong passphrase.
How do I check if my password was leaked?
Use services like Have I Been Pwned to check breaches. Our tester also flags very common or dictionary-style passwords. Never reuse a leaked password.
Should I use two-factor authentication (2FA)?
Yes — 2FA protects you even if a password is stolen. Prefer an authenticator app or hardware key over SMS when available.
What is entropy in password strength?
Entropy measures unpredictability. Higher entropy = harder to crack. Long, random passwords have the most entropy; predictable substitutions (a→@) add far less than people think.
How can I create a strong password I can remember?
Use a memorable passphrase of four or more random words plus a number or symbol, or store a generated password in a reputable password manager. Avoid reusing “clever” personal details.
Why does my strong-looking password show weak here?
Common words, repeating characters, or short length lower the score even with symbols. Try adding length or switching to unrelated words, then retest until the bar and tips improve.
Learn more: Complete guide to strong passwords · Generate a random password