JSON Diff Checker
Compare two JSON values by structure. See changed paths without treating object key order as a difference.
Open toolPassword Entropy Checker
Estimate bits as password length × log2 of the detected character-pool size. An upper bound for independently sampled characters, not a measured guess count or breach check.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Estimate password entropy.
Your result
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Result will appear here
How Password Entropy Checker works
Estimate bits as password length × log2 of the detected character-pool size.
An upper bound for independently sampled characters, not a measured guess count or breach check. Repetition, common words and human choices reduce real strength. Passwords stay in this page.
How to use Password Entropy Checker
Start with your own input.
Enter password to estimate
Replace the example with your password to estimate.
Input and settings
Set the options
Check the source against the supported syntax and limits below.
Tool result
Run and check the output
Select Estimate password entropy. Review an alphabet-based upper-bound entropy estimate, then use Copy result or download the result file.
Review the details
When to use Password Entropy Checker
Inspect an alphabet-based estimate
To inspect an alphabet-based estimate, start with password to estimate. Estimate bits as password length × log2 of the detected character-pool size.
Compare random-secret lengths
To compare random-secret lengths, start with password to estimate. An upper bound for independently sampled characters, not a measured guess count or breach check.
Understand why patterns weaken passwords
To understand why patterns weaken passwords, start with password to estimate. Review an alphabet-based upper-bound entropy estimate, then use Copy result or download the result file.
How to read the result
Check what the output means.
An alphabet-based upper-bound entropy estimate. Estimate bits as password length × log2 of the detected character-pool size.
An upper bound for independently sampled characters, not a measured guess count or breach check. Repetition, common words and human choices reduce real strength. Passwords stay in this page.
Supported input and limits
Check the format before processing.
An upper bound for independently sampled characters, not a measured guess count or breach check. Repetition, common words and human choices reduce real strength. Passwords stay in this page.
Inputs and results are handled in this browser.
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Open toolEstimate password entropy with your input
Review an alphabet-based upper-bound entropy estimate, then use Copy result or download the result file.
Password Entropy Checker: common questions
Answers about using Password Entropy Checker and understanding its results.
What does this tool support?
An upper bound for independently sampled characters, not a measured guess count or breach check. Repetition, common words and human choices reduce real strength. Passwords stay in this page.
Can I save the result?
Yes. Download the result file after processing. Text results also have Copy result. Processing uses local browser code; no account is required.