How to use the password strength checker
- Enter a password or a similar test example. The value remains on your device.
- Select Check strength to run the pattern-aware analysis.
- Review the score, adjusted entropy, attack estimates, detected weaknesses, and recommendations.
- Improve the password and test again. Aim for a unique 14–16+ character password or a longer random passphrase.
How the analysis works
Simple meters often reward uppercase letters and symbols while overlooking predictability. This checker starts with the theoretical search space, then reduces its estimate when it detects common passwords, leetspeak substitutions, dictionary words, keyboard patterns, alphabetical or numerical sequences, repeated characters, repeated chunks, years, dates, and low character uniqueness.
| Result | What it generally means | Recommended action |
|---|---|---|
| Very weak / Weak | Likely short, common, or highly predictable. | Replace it; do not make minor variations. |
| Fair | Some resistance, but patterns or insufficient length remain. | Increase length and remove predictable structure. |
| Good | Reasonable structure and length for many uses. | Ensure it is unique and stored in a password manager. |
| Strong / Very strong | Long and difficult to guess under this model. | Still use MFA and never reuse it. |
How to create a stronger password
- Prioritize length: use at least 14–16 characters; more is better for passphrases.
- Make every password unique: reuse turns one breach into access to multiple accounts.
- Use a password manager: generate and store long random passwords instead of memorizing them.
- Avoid personal information: names, birthdays, teams, phone numbers, and company names are guessable.
- Do not rely on substitutions: changing “password” to “P@ssw0rd” remains predictable.
- Enable multi-factor authentication: prefer passkeys or authenticator apps where available.
Every account needs a different password. Reuse makes unrelated services fail together after one breach.
Passkeys resist phishing and remove the need to create or remember a password for that account.
Secure the email account, backup codes and recovery methods that can reset your strongest password.
Frequently Asked Questions
Clear answers about privacy, scoring, attack estimates and safer password choices.
Does ZeeSharp transmit my password?
No. The analyzer executes locally in JavaScript. Only a generic tool-usage event is counted for subscription limits; the password itself is never included.
Is a high score proof that a password is safe?
No automated score is proof. The password may already be exposed in a breach, used on another service, or based on personal information unknown to this checker.
Why are online and offline attack estimates different?
Online services can rate-limit login attempts. In an offline attack, an attacker who obtains password hashes may test billions of guesses per second, depending on the hashing algorithm and hardware.
Are passphrases better than complex short passwords?
A long, randomly generated passphrase is often easier to remember and harder to guess. Avoid famous quotations, song lyrics, and predictable word combinations.