Password strength checker

See how hard a password is to crack

Runs in your browser. Nothing is uploaded.

How it works

A strong password is long and hard to guess, and complexity alone doesn’t make it so. This checks for common words, keyboard patterns and simple swaps like @ for a, then estimates how long cracking would take. It runs in your browser, so your password is never sent. Even so, avoid testing live passwords anywhere.

Look for common words, patterns and swaps, then estimate how many guesses it takes.

We use zxcvbn, a well-known checker that estimates how many guesses a password takes. It looks for patterns attackers try first.

The check loads when you start typing, and everything stays in your browser.

Worked example. “P@ssw0rd” looks complex, but it’s a common word with common swaps, so it’s weak. Four random words are far stronger, and easier to remember.

Examples

Password	Why
password	A very common word
qwerty123	A keyboard pattern
P@ssw0rd	A common word with common swaps

What this tool doesn’t cover

This is an estimate. A password that has leaked is weak however it scores.
The checker’s word lists are mostly English.

Questions

Is it safe to type my password here?

It never leaves your browser. Still, it’s best to test something similar, not your real password.

What makes a password strong?

Length and randomness. Four or more random words, or a password manager, work well.

Why is P@ssw0rd weak?

It’s a common word with swaps that attackers try first.

How long would my password take to crack?

The tool estimates this from known patterns, not just length. Treat the time as a guide, because it depends on how the password is stored.

How do I make a password stronger?

Make it longer. Four or more random words are easy to remember and hard to guess. Never reuse it.

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Built by QuickToolz.

Sources: Wheeler (2016), zxcvbn: Low-Budget Password Strength Estimation (opens in a new tab)