Password Entropy Calculator
Security ToolsSee how many bits of entropy a password has
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History
All history →Password Entropy Calculator — at a glance
Measure the strength of a password in bits.
How to use it — step by step
The password to check. It never leaves your device.
Add your text
Paste or type your input into the box. The Sample button fills in an example.
Press Calculate Entropy
The result is made instantly inside your browser.
Copy the result
Use the Copy button, or send it to another tool.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
What is entropy?+
It counts how many guesses a random password of that length and character set would need. Each extra bit doubles the work.
Is the number exact?+
No. It assumes every character is picked at random. A password like Password1! scores high but is easy to guess.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.