Password Entropy Meter - Free Online Tool | PivaBox

Calculate password entropy and estimate crack time — understand what makes a password strong

How to Use Password Entropy Meter

1. Type or paste a password in the input field — the tool analyzes it in real-time as you type
2. Review the entropy in bits, strength rating, and estimated crack times across 3 attack scenarios
3. Check the character breakdown (lowercase, uppercase, digits, symbols) and any common pattern warnings to understand how to improve your password

Frequently Asked Questions

Is Password Entropy Meter free?

Yes, PivaBox Password Entropy Meter is completely free to use. All analysis happens locally in your browser.

Are my passwords sent to a server?

No. All password analysis runs entirely in your browser using JavaScript. Your passwords never leave your device. The input is processed only in memory — no data is stored or transmitted.

What makes a password strong?

Password strength comes from <strong>length</strong> and <strong>character variety</strong>. Each additional character exponentially increases the search space. A 12-character password mixing lowercase, uppercase, digits, and symbols has about 78 bits of entropy — virtually uncrackable by brute force alone. Avoid common patterns like dates, keyboard walks, and dictionary words.