Password Strength Checker — How to Use and Read the Estimate
Use the OpenTrojan Password Strength tool to estimate password strength from entropy and common weak-password heuristics, and understand how to improve it.
Quick Answer
Password Strength estimates strength from entropy and known weak-password heuristics; treat it as a quick guidance signal and enable MFA regardless of the score.
Definition
Password Strength estimates a password's strength from entropy and common weak-password heuristics.
What it is
Password Strength (/tools/password/) estimates password strength from entropy and recognition of common weak patterns.
How to use
- Type a candidate password into
/tools/password/. - Read the strength estimate and the reasons behind it.
- Improve the password or, better, rely on passphrases + MFA.
Interpretation
- Entropy — combined character variability and length drive the estimate; longer passphrases usually outperform short “complex” strings.
- Weak-pattern flags — use of dictionary words, sequences, or personal data lowers strength.
- The result is guidance: a high score is not a guarantee, and MFA remains essential.
Limitations
- The estimate uses heuristics, not a live crack-time measurement; real security depends on the credential being unique to this site and never reused.
- It does not check whether the password is reused elsewhere — never reuse passwords.
Privacy
The tool operates on the string you enter; a hash/heuristic may be computed locally. For best privacy, never paste a real credential into guidance tools — use a throwaway candidate or rely on offline password managers.
Next steps
- Build a strong password policy → Password security guide.
- Add a second factor → Identity & MFA hub.
References
Ask OpenTrojan's evidence-backed assistant about this topic — answers cite their sources.