Password Strength Checker
Password Strength Checker — Find Out If Your Password Is Actually Safe
Test your password strength free — no data stored, no account needed. Just the truth about how secure your password really is.
Password Strength Checker
Enter a password to check
12+ characters
Uppercase letter
Lowercase letter
Number
Symbol (!@#…)
No common pattern
How to make it stronger:
Need a strong password? Generate one instantly — free, no sign-up.
Generate a Strong Password →🔒 Your password never leaves your browser. Zero data stored.
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Quick Tips
Pro Tip: Use this Password Strength Checker to test passwords you’ve created elsewhere — not just ones you plan to use. It gives you a detailed breakdown of what’s weak and exactly how to fix it, so you stop guessing and start knowing your password is actually safe.
What Makes a Password Strong?
A strong password isn’t just one that’s hard to guess — it’s one that takes a computer a very long time to crack. Our password strength checker measures entropy (randomness), length, character variety, and checks for patterns attackers already know.
Length Is More Important Than You Think
A 12-character password is exponentially harder to crack than an 8-character one — even if both use symbols. Every character you add multiplies the number of possible combinations. Aim for at least 12 characters. Sixteen is better. Twenty is ideal.
Complexity Matters — But Not the Way You Were Taught
Swapping “a” for “@” or “o” for “0” doesn’t fool modern cracking tools — they’re already programmed for it. True complexity means mixing uppercase, lowercase, numbers, and symbols in unpredictable ways. Or better: use a passphrase. Try our password generator to create one instantly.
Common Passwords That Are Never Strong Enough
“Password1!”, “123456”, “qwerty”, your name + birth year — these are the first passwords any attacker tries. Even if a password strength checker scores them medium, they’re compromised the moment your data appears in a breach. Use our checker, then use our generator to create something genuinely new.
password1!
✕
123456789
✕
qwerty123
✕
john1990
✕
iloveyou
✕
admin@123
✕
Frequently Asked Questions
Is it safe to use a password strength checker?
Yes — as long as the tool processes your password locally in your browser and doesn’t send it to a server. The RelyPass password strength checker is 100% client-side. Your password never leaves your device. We store nothing.
How does the password strength checker work?
We calculate your password’s entropy — the total randomness based on length and character variety. We also check it against known weak patterns and common password lists. The result tells you how long it would realistically take an attacker to crack it.
What is a good password strength score?
Aim for a password that would take at minimum months — ideally centuries — to crack. This usually means 16+ characters with a mix of uppercase, lowercase, numbers, and symbols. Our checker will tell you exactly where you stand.
Should I type my real password into a strength checker?
With RelyPass, yes — because nothing is transmitted. But as a general rule: never type your real passwords into tools you don’t trust. If you’re unsure, test a similar password instead, or generate a new strong one using our password generator.
What's the difference between a strong password and a secure password?
A strong password is hard to guess or crack computationally. A secure password is also unique — never reused across accounts. The strongest password in the world is still a liability if it’s used on ten different sites. Use a password manager to keep each one separate.
How do I create a strong password?
Use at least 16 characters. Mix uppercase, lowercase, numbers, and symbols. Avoid real words, names, or dates. Or skip the guesswork — use our free password generator to get one instantly.