How to Use a Password Strength Checker
Enter a password string to see a strength score, label, character categories, entropy estimate, estimated crack-time band, and pattern feedback. An empty field is accepted and returns a zero-score result.
What the password strength checker evaluates
Use the Password Strength Checker to review a password string before deciding whether it is suitable for a particular use. It examines length and character composition, then presents a bounded strength score, a label, an entropy estimate, an estimated crack-time display, and feedback for patterns it detects.
The checker recognizes lowercase letters, uppercase letters, digits, and symbols. A symbol is a character outside ASCII letters and digits. Its result is a practical assessment of the supplied text, not a standards-based security certification or a guarantee about real-world attacks.
How to check a password
- Open the Password Strength Checker.
- Enter the password text you want to review in the password field. The field is optional and starts empty.
- Review the result after entering the text. Check the strength label and score, then note the detected character categories.
- Read the entropy estimate and the estimated crack-time display. The checker calculates the time estimate from the entropy result using one billion guesses per second and formats it as a time band such as instant, seconds, minutes, hours, days, years, or centuries.
- Read the feedback for detected patterns. If the text contains a recognized commonly used password, repeated characters, or a recognized ascending or numeric sequence, use that feedback when revising the password.
- Test a revised string separately if you want to compare how changes in length or composition affect the assessment. Do not use a password that protects an important account merely as a test sample.
How to read the result
A higher score means the checker assigned more points within its 0-to-7 range. The label runs from Very Weak to Perfect. Scores rise at length thresholds of 8, 12, 16, and 20 characters, and composition changes can add points when the text includes both letter cases, a digit, or a symbol.
Repeated characters and recognized sequences can lower the score. A commonly used password receives a zero score and feedback identifying that pattern. For an empty field, the checker accepts the input but returns a zero score, no detected categories, zero estimated entropy, zero estimated crack time, an instant display, and no feedback.
Treat entropy and crack-time results as estimates produced by this checker. They do not promise resistance to attack or predict the duration of a real-world password cracking attempt. The assessment also does not account for every possible weakness, such as information an attacker may know about the person who created the password.
Worked example
You want to review a sample password before choosing a stronger version for an account.
Enter “Summer2024!” into the checker and review the displayed assessment and feedback without using the sample as a credential.
The result includes a strength score and label, detected character categories, an entropy estimate, an estimated crack-time display, and any feedback for recognized patterns. The particular values depend on the supplied text.
Limitations
- The score, entropy, and crack-time display are estimates from this checker’s rules. They do not model every password weakness, attacker situation, or real-world cracking outcome.
Common errors
- Mistake: changing only the final character while leaving a repeated run or recognized sequence in place. Correction: review the feedback and change the pattern itself, then check the revised text again.
FAQ
Can I check the tool with an empty password field?
Yes. The field is optional, and an empty input is accepted with a zero score, no detected categories, zero entropy, zero estimated crack time, an instant display, and no feedback.
What affects the password strength score?
The score can increase at lengths of at least 8, 12, 16, and 20 characters. It can also increase when the text combines lowercase and uppercase letters, a digit, or a symbol, while repetition and recognized sequences can reduce it.
Does the crack-time estimate guarantee password security?
They are estimates based on the checker’s entropy calculation and a rate of one billion guesses per second. They are not guarantees about resistance to attack or the duration of a real-world cracking attempt.