FREE · DEVELOPER TOOLS
Random Password Entropy Calculator.
Calculate theoretical entropy for independent uniform character choices.
How to use Random Password Entropy Calculator
Enter the required text or settings and generate locally. Review the displayed algorithm and limits before copying or downloading.
How it works
Calculate theoretical entropy for independent uniform character choices. This is a mathematical model, not a strength score for a human-chosen password. Web Crypto uses the browser’s secure random generator; pasted data is not sent to a server.
Example
Generate the supplied public example settings to inspect the result.
Questions about Random Password Entropy Calculator
Is Random Password Entropy Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
This is a mathematical model, not a strength score for a human-chosen password. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.