Password strength analyser
Estimate a password’s entropy and how long a brute-force attack would take.
Loading tool…
About the password strength analyser
Estimates how much entropy a password carries based on its length and the character sets it draws from, then converts that into an offline cracking time at ten billion guesses per second. Everything is computed locally as you type.
Frequently asked questions
Why does my password score well but feel weak?
Entropy maths cannot recognise words. "Password123!" scores respectably on character variety but appears in every cracking dictionary, so it falls in seconds. Length plus unpredictability beats symbol soup.
What makes a genuinely strong password?
Four or five random words from a large list, or 16-plus characters from a password manager. Both beat a short password decorated with substitutions, and only one of them is memorable.