How Password Entropy Works
Password Entropy
Entropy Estimate
Entropy measures unpredictability in bits. This tool estimates entropy from password length and character set diversity — a heuristic, not a guarantee against dictionary attacks.
Password Entropy Checker
Analyze password strength with estimated entropy bits and practical suggestions. Paste a password and click Run.
- Runs entirely in your browser
- No data stored or sent to a server
- Free forever — no signup
- Instant conversion
Input and Output
Use the interactive encoder and decoder on this page to process your text.