Password Strength Checker
Check how strong your password is with entropy calculation, crack time estimation and detailed analysis. Everything runs in your browser — your password is never sent anywhere.
Enter a password above to see its strength analysis.
Entropy explained
Entropy measures password randomness in bits. Higher entropy means more possible combinations, making brute-force attacks exponentially harder.
100% client-side
Your password never leaves your browser. All analysis runs locally using JavaScript — no network requests, no logging, no risk.
Crack time estimates
Online estimates assume rate-limited login attempts (100/s). Offline estimates assume a GPU cluster testing 10 billion hashes per second.
How to Use Password Strength Checker
Our Password Strength Checker analyzes your passwords in real time to reveal their entropy, estimated crack time, and overall robustness. Everything runs locally in your browser, so your passwords are never transmitted over the network. Use this tool to evaluate existing passwords or craft stronger ones before updating your accounts.
Open the Password Strength Checker
Navigate to the Password Strength Checker from the cybersecurity tools menu. The tool loads entirely in your browser, ensuring your passwords are never sent to any external server.
Enter or Paste a Password
Type a password into the input field or paste one from your clipboard. The analyzer begins evaluating the password instantly as you type, providing immediate feedback.
Review the Strength Score
Examine the visual strength meter and the overall score. The tool rates your password from very weak to very strong based on length, character diversity, and common pattern detection.
Check Entropy and Crack Time
Review the bits of entropy and the estimated time it would take for various attack methods to crack the password, from brute force to dictionary attacks.
Read Improvement Suggestions
The tool provides actionable suggestions such as adding special characters, increasing length, or avoiding common words to help you create a more secure password.
Iterate and Strengthen
Modify your password based on the feedback and watch the strength score update in real time until you reach a satisfactory security level.
Common Use Cases
Auditing Existing Passwords
Evaluate the strength of passwords you currently use across various accounts to identify which ones need immediate replacement.
Creating Master Passwords
Craft a robust master password for your password manager by iterating until the tool reports maximum strength and a crack time of centuries.
Security Awareness Training
Demonstrate to team members why common passwords are weak and how small changes can dramatically improve security posture.
Compliance Verification
Verify that newly created passwords meet organizational policies requiring a minimum entropy level or specific character composition.
Pro Tips
- -Aim for at least 80 bits of entropy to resist modern brute-force attacks effectively.
- -Passphrases made of four or more random words often outperform short complex passwords in both strength and memorability.
- -Avoid using personal information such as birthdays, pet names, or common keyboard patterns like 'qwerty'.
- -Use this tool in combination with a password manager to generate and store unique passwords for every account.
You might also like
SRI Hash Generator
Generate Subresource Integrity hashes for scripts and stylesheets.
CybersecurityPing Tool
Measure response time and availability of any URL or domain.
CybersecurityAPI Tester
Test REST APIs with GET, POST, PUT, DELETE and custom headers.
DeveloperCompress PDF
Reduce your PDF file size without losing visible quality.
PDFRecommended tools & services
We may earn a commission at no extra cost to you.