Is This Password Strength Checker Safe to Use?

Short answer - YES! Your password never leaves your browser. The entire password strength test runs locally on your device. There is no code that sends your password to a server, stores it, or logs it anywhere.

How Your Password Is Processed - Step by Step

Transparency matters when you are typing a password into any website. Below is a complete breakdown of how our password strength checker handles every password you enter. Everything is processed locally on your machine - you could load the page, disconnect from the internet entirely, and then test your password just to be absolutely sure.

• No form submission: The password input is not inside a form and there is no submit action. Nothing is posted anywhere.
• No network calls: There is no fetch, XMLHttpRequest, sendBeacon, WebSocket or image-based tracking call that includes the password. The JavaScript only reads passwordInput.value and works with it in memory.
• All analysis is client-side: The functions that calculate estimated crack time, entropy, character pool size, and password length all run entirely in your browser. Nothing is sent externally.
• zxcvbn library: The only external script loaded is zxcvbn.js, an open-source password strength estimator built by Dropbox. Once loaded, it runs entirely in your browser. Your password is passed into the function locally and never transmitted anywhere.
• No analytics or tracking code: There is no Google Analytics, Plausible, PostHog, Meta pixel, or similar tracker on this site. There are also no cookies set by any page.
• No storage usage: The code does not write to localStorage, sessionStorage, IndexedDB or cookies. Once you close or refresh the page, the password value is gone completely.

Why Does Privacy Matter for Password Checkers?

If you are going to type a real password into a website, you need to trust that it stays private. Many online password checkers do not make their approach clear, and some do send data back to a server. We built cracking.pw to be different. The entire tool runs in your browser using JavaScript, which means your password exists only in your device's memory for as long as the page is open.

This is particularly important because the passwords people test are often ones they are actively using. If you want to understand what makes a password strong or check whether your current password is vulnerable to a brute-force attack, you should be able to do that without worrying about who else might see it.

Can I Verify This Myself?

Absolutely. Because this is a simple client-side website, you can inspect everything yourself. Right-click on the password checker page, select "View Page Source" or open your browser's developer tools, and read through the JavaScript. You will see there are no outbound network requests that include your password. If you want to go a step further, open the Network tab in your browser's developer tools before typing, and watch - nothing is sent.

You can also test offline. Load the page, turn off your Wi-Fi or unplug your ethernet cable, and the password checker will still work perfectly. That alone proves the analysis happens entirely on your device.