Tool capabilities
- Input
- TXT
- Output
- TXT · JSON
How to use Password Entropy Calculator
Calculate the theoretical entropy of a uniformly random password from its length and alphabet size. This is not a strength estimate for a human-chosen password. This password entropy calculator works directly in your browser and is free to use without an account.
- Paste or open your input in the editor.
- Run the tool and inspect the output. If the input is invalid, correct the reported error and run it again.
- Copy the result or download it to your device.
Password Entropy Calculator · Example
Input
Run with the displayed settings.
Output
{
"bits": 104.8734216268422,
"assumption": "Each character is selected independently and uniformly from the stated alphabet."
}Calculate the theoretical entropy of a uniformly random password from its length and alphabet size. This is not a strength estimate for a human-chosen password.
Usage notes
Inputs and results are processed on this device. Tool content is not sent to a processing server.