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Password Strength Checker

Check how strong a password is, estimated crack times for online and offline attacks, and specific tips to improve it — entirely offline in your browser.

In-browser · no upload

Checked entirely on this page — nothing is sent anywhere. Avoid testing passwords you actively use on shared computers.

Runs entirely in your browser. Your files and text are not uploaded to our servers.

To test a password’s strength, type it in the box. You’ll see a rating, an entropy estimate, how long a guessing attack might take, which character types it uses, and specific problems such as keyboard patterns, repeated characters, years or common passwords.

How to use the Password Strength Checker

  1. 1

    Type a password

    Use Show/Hide to check what you typed.

  2. 2

    Review the rating and tips

How it works

Entropy is estimated from length and the character types used, then reduced for predictable patterns: common passwords (including simple letter-number substitutions like p@ssw0rd), keyboard runs (qwer, 1234), repeated characters, years, and the very common “Word123!” shape. Crack times assume 100 guesses per second for an online attack and 10 billion per second for an offline attack on a fast hash.

Features

  • Pattern detection

  • Two attack scenarios

  • No network

    The password never leaves the page.

Privacy and file handling

Where it runs
Runs in your browser

Runs entirely in your browser. Your files and text are not uploaded to our servers.

Limitations

  • Estimates are approximate; real attackers use lists of leaked passwords that can crack “strong-looking” passwords that were used elsewhere.

Frequently asked questions

Is it safe to type my real password here?

The check runs entirely in your browser with no network requests. Still, prefer testing similar passwords rather than ones you actively use.

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