Password Strength Tester

Analyze the entropy and security level of your passwords instantly without sending data to the cloud.

Passwords are analyzed locally in your browser. Nothing is sent to the internet.

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Password Length
0
Entropy
0 bits
Crack Time
Instant
Composition

Password Strength Tester

Utility: Evaluates the complexity and resistance to brute-force attacks of a given password.

Definitions:
- Entropy: A measure of unpredictability. Higher entropy means a password is harder to crack.

Background: Traditional password advice (complex characters, frequent changes) is being replaced by passphrases (long, memorable strings).

Fun Fact: An 8-character password with letters, numbers, and symbols can be cracked in about 5 minutes today. A 16-character password using ONLY lowercase letters would take over a million years!
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