# Password strength checker

See how hard a password is to crack

Use it at https://www.quicktoolz.com/tools/password-strength-checker. From QuickToolz.

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.

## How it works

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.

## Sources

- [Wheeler (2016), zxcvbn: Low-Budget Password Strength Estimation](https://www.usenix.org/conference/usenixsecurity16/technical-sessions/presentation/wheeler)