Password Strength Meter — Local Check | How to use and interpret results
Estimate entropy and a strength band from string length and character-pool size. It is a combinations model rather than an attack predictor trained on how people choose passwords.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Numbers stay on your device. Nothing is sent to a server.
Next step
How to use this tool
Use a structurally similar test string instead of a live account secret. Compare lengths and pools while remembering that familiar words are not random character selections.
Results and examples
Within the same character pool, increasing length raises the estimated bit count. A strong label can still be misleading for a famous phrase or repeating pattern.
Worked example
Within the same character pool, increasing length raises the estimated bit count. A strong label can still be misleading for a famous phrase or repeating pattern.
Limitations
- Breach dictionaries and an account's online attack defences are not queried.
- Cracking time and the true entropy of human choices are not guaranteed.
Fields
| Field | Guidance and constraints |
|---|---|
| Password | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Why does greater length increase the bit estimate?
Within the same character pool, increasing length raises the estimated bit count. A strong label can still be misleading for a famous phrase or repeating pattern.
Does strong mean the password has never leaked?
Breach dictionaries and an account's online attack defences are not queried. Cracking time and the true entropy of human choices are not guaranteed.
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