Is my password sent to a server?

No. All analysis happens entirely in your browser. Your password never leaves your device.

Password entropy (in bits) measures how unpredictable a password is. Higher entropy = harder to crack. Aim for 60+ bits for good security.

What makes a password strong?

Length (12+ characters), a mix of uppercase/lowercase/numbers/symbols, no dictionary words, and uniqueness per account.

How is strength level determined?

We check 7 criteria. 1-2 passed = Very Weak, 3 = Weak, 4 = Fair, 5 = Good, 6 = Strong, 7 = Very Strong.

What are common passwords?

We check against a list of the 15 most commonly used passwords (like "123456", "password", "qwerty") and warn if your password matches.

ToolsArena

Password Strength Checker

Check how strong your password is with detailed analysis and tips.

Enter Password to Check

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Requirements

At least 8 characters

At least 12 characters

Uppercase letter (A-Z)

Lowercase letter (a-z)

Number (0-9)

Special character (!@#$…)

No common patterns

Tips for a strong password

Use at least 12 characters — longer is stronger
Mix uppercase, lowercase, numbers, and symbols
Avoid dictionary words, names, and personal info
Use a passphrase: "Coffee$Runs#Every!Morning"
Use a unique password for every account

How to Use Password Strength Checker

1
Type or paste your password.
2
Toggle the eye icon to show/hide characters.
3
View the strength bar and level (Very Weak to Very Strong).
4
Check which criteria are met in the requirements list.
5
Read the tips panel for advice on improving your password.

About Password Strength Checker

Analyze any password's strength against 7 security criteria including length, character variety, and common patterns. Shows a color-coded strength bar (Very Weak to Very Strong), entropy estimate in bits, character type counts, and detailed checklist. Warns if the password is in the list of most common passwords.