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Password Entropy Calculator — Free Online Tool

📊 Features

🧮 Entropy in Bits

Measures password randomness in bits.

⏱️ Crack Time

Estimates how long an offline brute-force attack would take.

🔒 100% Private

Analysis happens in your browser — nothing sent to a server.

📋 How It Works

  1. Enter a password above
  2. We calculate its entropy based on length and character diversity
  3. Get a bit score and estimated crack time

❓ FAQ

What is password entropy?

Password entropy measures the unpredictability of a password in bits. Higher entropy means a stronger, harder-to-crack password.

How much entropy do I need?

Aim for 60+ bits of entropy. At 80+ bits, your password is effectively uncrackable by offline attacks.

Is my password sent to a server?

No. Entropy is calculated entirely in your browser for total privacy.

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