🔒 100% Private & Client-Side

Check how strong your password really is

Type any password below to see its entropy, estimated crack time, and concrete tips to make it stronger — analyzed instantly in your browser. Nothing is ever sent to a server.

Enter a password above 0 bits of entropy
0 Length
0/4 Character sets
0 Entropy (bits)
0 Unique chars
Lowercase Uppercase Numbers Symbols

Estimated time to crack

Online guessing — ~100 tries/hour, throttled
Offline, slow hash — ~10k guesses/sec, e.g. bcrypt
Offline, fast hash — ~10B guesses/sec, GPU cluster

Suggestions

Start typing a password to see personalized suggestions for making it stronger.

Analyzed entirely in your browser — your password is never stored, transmitted, or logged.

Why check your password here

A meaningful strength check, not just a red/yellow/green bar.

Truly private

Analysis runs locally with JavaScript. Your password is never sent over the network or logged.

Real entropy math

See the actual bits of entropy behind your password, not just a vague label.

Realistic crack times

Compare estimates across online guessing and offline hash-cracking scenarios.

Actionable tips

Get specific, plain-language suggestions instead of a generic strength score.

What the checker looks at

Strength depends on more than length and symbols alone.

Length & character variety

Counts how many character sets you use — lowercase, uppercase, numbers, and symbols.

Repetition & sequences

Flags runs like "aaaa" or "1234" that make a password easier to guess than its length suggests.

Keyboard patterns

Detects common walk patterns like "qwerty" or "asdfgh" that attackers try first.

Commonly leaked passwords

Checks against a list of widely used, already-compromised passwords.

Entropy in bits

Translates all of the above into a single, comparable number: bits of entropy.

Works everywhere

Fully responsive and accessible on desktop, tablet, and mobile devices.

How it works

Three simple steps to a clear picture of your password's strength.

Type your password

Enter it into the field above — it stays on your device the entire time.

See instant analysis

Your browser calculates entropy, crack-time estimates, and character composition live.

Improve it

Follow the tailored suggestions, or head to the generator for a strong password instantly.

Frequently asked questions

Everything you might want to know about using this checker safely.

No. Every character you type is analyzed locally in your own browser using JavaScript. Nothing is transmitted to a server, logged, or stored — not even temporarily.

Entropy measures how unpredictable a password is, expressed in bits. Higher entropy means exponentially more possible combinations an attacker would have to try before guessing it correctly.

The tool estimates the average number of guesses needed based on the password's entropy, then divides that by common attack speeds for online guessing and offline hash cracking to produce a rough time estimate.

Length alone is not enough. Repeated characters, keyboard patterns like qwerty, sequential runs like abc or 123, and common leaked passwords all make a password far easier to guess than its length suggests, so the checker reduces the score accordingly.

It's safe to do so since analysis happens entirely offline in your browser, but as a general rule of thumb it's good practice to avoid typing real passwords into any website. You can also test a similar pattern instead.

More free tools

The same private, client-side approach for everything else you need to generate.

Learn more about password security

Practical, easy-to-follow guides to help you stay protected online.

Need a stronger password instead?

Generate a random, cryptographically secure password in one click — or try a memorable Diceware passphrase instead.

Try the Password Generator