Password Tester Form
Use draft or newly created passwords only. Avoid entering active production credentials.
Example Data Table
These sample rows use the same scoring engine as the calculator.
| Sample | Masked Preview | Length | Entropy Bits | Score | Strength |
|---|---|---|---|---|---|
| Sample A | r**n | 4 | 18.80 | 12 | Very Weak |
| Sample B | S********6 | 10 | 59.54 | 59 | Moderate |
| Sample C | Q********! | 10 | 65.70 | 0 | Very Weak |
| Sample D | N************7 | 14 | 91.98 | 91 | Strong |
Formula Used
Entropy estimate: Entropy bits ≈ password length × log₂(character set size).
Character set size: Sum the active pools used by the password, such as lowercase letters, uppercase letters, digits, symbols, and spaces.
Score model: Score = length points + variety points + entropy points + uniqueness points − penalties for dictionary terms, keyboard walks, sequences, and repeated runs.
Expected attempts: Expected attempts ≈ 2^(entropy bits − 1).
Crack time estimate: Crack time ≈ expected attempts ÷ guesses per second.
This calculator is an estimator for training, review, and design checks. It does not replace password managers, MFA, breach detection, or secure hashing policies.
How to Use This Calculator
- Enter a draft password and confirm it in the second field.
- Set your required minimum length and desired target score.
- Add custom banned terms, such as product names or usernames.
- Submit the form to generate the result section above.
- Review score, entropy, pattern warnings, and crack-time estimates.
- Use the suggestions list to strengthen weak areas.
- Download the current analysis as CSV or PDF.
- Retest improved versions until the policy status passes.
FAQs
1) Does a higher score guarantee safety?
No. A higher score improves estimated resistance, but real security also depends on hashing, rate limits, MFA, reuse prevention, breach monitoring, and user behavior.
2) Why are dictionary words penalized?
Attackers often try common words, brand names, role names, and leaked password fragments first. Even long passwords become weaker when they contain predictable words.
3) Why do sequences like 1234 reduce the score?
Simple sequences and keyboard walks are common human habits. They shrink effective unpredictability because attackers model and test these patterns early.
4) What entropy value should I aim for?
For many practical cases, 60 bits is a useful baseline. Higher-risk accounts, administrative access, and long-lived credentials benefit from stronger values.
5) Should I test real passwords here?
It is better to test drafts, patterns, or newly generated candidates. Avoid submitting active production passwords on any external page.
6) Why does length matter so much?
Longer passwords increase the search space quickly. Extra length usually helps more than adding one symbol to a short password.
7) Can a passphrase outperform a short complex password?
Yes. A long, unique passphrase with unrelated words and separators can outperform a short, cramped password full of predictable substitutions.
8) Why does the calculator compare multiple crack scenarios?
Different systems face different attack conditions. Online logins are slower, while offline attacks against stolen hashes can be dramatically faster.