Password Entropy Calculator

What is Password Entropy Calculator?

Password Entropy Calculator is a free, browser-based tool that helps you get the job done quickly. Measure password entropy in bits and estimate crack time. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

Used by

• Security analysts
• Data engineers
• Compliance teams
• Developers

Recommended workflow

1. 1

   Prepare the input

   Use this tool as the focused step in a larger browser-based workflow.

2. 2

   Run Password Entropy Calculator

   Review the preview, copy or download the result, and keep everything local in your browser.

3. 3

   Next recommended tool

   Password Strength: Estimate entropy and crack time of any password.

   Open tool
4. 4

   Then continue with

   Password Generator: Generate cryptographically strong random passwords with entropy display.

   Open tool
5. 5

   Then continue with

   bcrypt Generator: Generate and verify bcrypt password hashes with a chosen cost.

   Open tool

Frequently asked questions

How do I use Password Entropy Calculator?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Measure password entropy in bits and estimate crack time.

Is my data uploaded or stored anywhere?

No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.

Is Password Entropy Calculator free?

Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.

What's the maximum file size?

There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.

Do I need to install anything?

No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.