About Password Strength Checker Free — Test Password Security & Entropy
Evaluate password resilience against brute-force dictionary attacks. Check entropy, character diversity, and estimated cracking time to keep your accounts secure.
Key Features & Capabilities
- Instant visual strength meter (Very Weak to Very Strong)
- Calculates estimated crack time against modern GPU supercomputers
- Measures Shannon entropy bits and dictionary vulnerability
- Actionable tips to improve password security
- 100% private — passwords are never transmitted anywhere
How to Test Password Strength
Step 1: Enter Password
Type a sample password to audit.
Step 2: Review Security Metrics
Inspect entropy bits, estimated crack duration, and vulnerability checks.
Step 3: Strengthen Password
Apply suggested recommendations to achieve maximum security score.
Frequently Asked Questions
Is it safe to test my real password here?
Yes! The auditing algorithm executes purely on your device using JavaScript with zero network calls.
How is crack time calculated?
Crack time is estimated by calculating total permutations and testing against a simulated cluster testing billions of hashes per second.
Related Utility Tools
Why Zaeyon?
Private, free, and browser-based — no account, no uploads, no compromises.
Zero Uploads
Your files never leave your device. All processing happens locally in your browser memory — nothing is sent to any server.
100% Free Forever
No subscriptions, no hidden fees, no daily limits. Every tool on Zaeyon is permanently free to use without an account.
Instant & Powerful
Powered by WebAssembly — the same low-level technology used in native apps — so processing is fast even for large files.
Works Offline
Once the page loads, the WebAssembly engine runs entirely on your device. No internet connection needed to process files.
Works Everywhere
No software installation required. Runs directly in your browser on Windows, Mac, Linux, iOS, and Android.