Password entropy estimator
Estimate pool and Shannon entropy of a password without uploading it.
Loading tool…
Recommended next step
Protect and verify your data
After using Password entropy estimator, continue with Entropy analyzer.
Continue this path
Tools selected to complete the same task.
Tool guide
Password entropy estimator: how it works
Practical information to understand the result and use this tool correctly.
About Password entropy estimator
Type or paste a password to score it locally: charset pool bits (length × log2 of the pool) and Shannon bits from repeated characters.
Pool bits are an upper bound for random passwords; a dictionary phrase can be much weaker than the formula suggests.
How to use it
- 1Type or paste the password.
- 2Read pool bits, Shannon bits, and the strength band.
- 3Clear the field when you are done.
Frequently asked questions
- How are pool bits computed?
- Length × log2(charset pool): lowercase 26, uppercase 26, digits 10, symbols 33, space 1.
- Is my password uploaded?
- No. Counting runs locally in your browser; nothing is sent or stored.