CompareYourSecurity ← Back to site

Password Strength Checker

Test how strong your password is — privately, in your browser.

Everything runs in your browser. Nothing you type is stored, logged, or sent anywhere.
Strength
—
Length0
Estimated entropy0 bits
Time to crack (offline)—

Crack-time assumes a fast offline attack (~10 billion guesses/sec). Use a unique passphrase for every account.

Want a professional to double-check?

Get a free, no-obligation home security assessment.

Get a free quote

How strong is your password?

This free password strength checker measures how hard your password would be to crack. It looks at length and the mix of character types (lowercase, uppercase, numbers and symbols) to estimate entropy — the number of bits of randomness — and translates that into an estimated time for an attacker to guess it with a fast offline attack. As a rule of thumb, longer beats complex: a 16-character passphrase of ordinary words is far stronger than a short password full of symbols.

Crucially, this tool is 100% private. Your password is analyzed entirely in your browser using JavaScript — it is never uploaded, stored, or logged anywhere, so it's safe to test real passwords. For the best security, use a password manager to create a unique, random 14+ character password for every account, and turn on two-factor authentication wherever it's offered. Reusing passwords is the single biggest risk, because one breached site exposes every account that shares that password.

Frequently asked questions

Is it safe to type my real password here?
Yes. The checker runs entirely in your browser with JavaScript. Your password is never sent over the internet, stored, or logged — you can even disconnect from the network and it still works.
What makes a strong password?
Length is the most important factor. Aim for 14+ characters, ideally a passphrase of several random words, and use a unique password for every account. A password manager makes this easy.
How is 'time to crack' calculated?
We estimate entropy from length and character variety, then assume a fast offline attack of about 10 billion guesses per second. It's an approximation to illustrate relative strength, not a guarantee.
Should I use symbols and numbers?
They help, but a longer passphrase helps more. 'correct-horse-battery-staple' beats 'P@ss1!' by a wide margin. Combine length with a mix of character types for the best result.

Embed this free tool on your site

Copy and paste this snippet anywhere. It's free to use with attribution.

100% client-side · no tracking · no data leaves your device.
Estimates are for guidance only. Replace this footer with your brand.