Password Strength Checker

Instantly check how strong your password is. Get a real-time strength score, requirement checklist, and estimated crack time.

Real-time analysis Requirement checklist Your password never leaves your browser

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Very WeakWeakFairStrongExcellent

At least 8 characters

At least 16 characters

Uppercase letters (A–Z)

Lowercase letters (a–z)

Numbers (0–9)

Symbols (!@#$%...)

Not a common/predictable password

Not found in known data breaches

Type PasswordEnter your password in the input field above

See StrengthThe strength bar updates instantly as you type

Check RequirementsEach criterion lights up green when met

Improve ItAdd characters or types until all checks pass

Checked entirely in your browserYour password is analyzed locally — it is never sent to our servers.

Never transmittedAnalysis happens on your device and the password never leaves your browser.

Nothing storedWe don't log or save any password you type here.

No third-party sharingNo ad networks, analytics, or trackers ever see what you type.

Works offlineSince nothing is sent to a server, this tool keeps working even without an internet connection.

About Password Strength Checker

What Is a Password Strength Checker?

A password strength checker evaluates how resistant a password is to guessing and cracking attempts, based on length, character variety, and whether it matches common patterns attackers already account for — helping you spot a weak password before it becomes a security problem.

How Our Password Strength Checker Works

Enter a password, and the tool analyzes its length, character mix, and pattern predictability, then returns a strength rating along with specific suggestions for improvement.

How to Use the Password Strength Checker

Enter the password you want to evaluate
Review the strength rating and feedback
Adjust length or character variety based on the suggestions

Key Features

Detailed strength rating — not just a pass/fail result
Specific improvement suggestions — add length, symbols, or reduce predictability
Runs entirely in your browser — your password isn't transmitted or stored

Who Uses This Tool

Anyone setting a new password can confirm it's genuinely strong before using it. IT teams use it to educate users on what makes a password weak.

Frequently Asked Questions

Is it safe to check a real password here?
The check runs client-side and isn't transmitted or stored, but as a best practice avoid testing a password you're currently actively using on an important account.

Is this tool free?
Yes, checking password strength is completely free.

Frequently Asked Questions

Does my password get stored or sent anywhere?

No — the password you type is analyzed entirely in your browser using JavaScript. It is never sent to any server, logged, or stored anywhere. You can disconnect from the internet and the tool will still work perfectly.

What makes a password strong?

A strong password has at least 12 characters and uses a mix of uppercase, lowercase, numbers, and symbols. Longer is better — each additional character multiplies the number of possible combinations exponentially. Avoid dictionary words, names, and sequential patterns like "123456" or "qwerty".

What does the crack time mean?

The estimated crack time is based on a brute-force attack trying billions of password combinations per second. Modern GPUs can test 10+ billion combinations per second. A password rated "Excellent" would take centuries to crack even with powerful hardware — but weak passwords can fall in seconds.

Is a longer password always better?

Yes — length is the single most important factor. A random 20-character lowercase-only password is stronger than a 10-character password with all character types. The best strategy is to combine length with variety: 16+ characters using all four character types.

How does the data breach check work — is my password sent anywhere?

We use the Have I Been Pwned "k-anonymity" API. Your password is hashed with SHA-1 entirely in your browser, and only the first 5 characters of that hash are sent to the API — never your actual password or the full hash. The API returns all breach hashes sharing that prefix, and the match is found locally in your browser. This is the same privacy-preserving method used by 1Password and Bitwarden.

Why did a long, complex-looking password still score low?

Character variety alone doesn't guarantee strength. This checker also flags predictable patterns — keyboard sequences like "qwerty" or "12345", repeated characters, and known breached/common passwords — because attackers try these first, regardless of length. A password that passes every check here has no obviously guessable structure.