Password Strength Visualizer
See how long it would take a GPU cluster to crack your password. Instant entropy analysis, pattern detection, and improvement tips — all in your browser.
⚠ Use a test password only — never your real credentials. Nothing leaves your browser.
—
GPU cluster crack time
—
Entropy (bits)
—
Length
—
Guesses needed
Suggestions
Crack time assumes a dedicated GPU cluster running 10 billion hashes/sec (bcrypt-equivalent offline attack). Real-world times vary by hashing algorithm and attacker resources.
Disclaimer: Free tool provided “as is” by MonitorGiant. No warranty or liability for any data loss, security issues, or infrastructure problems arising from use of this tool. Results are for informational purposes only. · A Free Tool by MonitorGiant
How Password Strength Visualizer works
The analyser runs entirely in your browser using the zxcvbn library — the same algorithm used by major password managers. It models real-world attacker behaviour rather than simple character-count rules.
- 1
Type or paste a test password
Use a sample or fictional password — never your real credentials. The field stays local; nothing is transmitted anywhere.
- 2
See the GPU crack-time estimate
The tool calculates how long a dedicated cluster running 10 billion guesses per second would take to crack it via offline brute-force — the most realistic threat model.
- 3
Review pattern warnings
Common keyboard patterns (qwerty, 123456), dictionary words, names, and dates are detected and flagged. These drastically reduce real-world strength even on long passwords.
- 4
Follow the improvement suggestions
zxcvbn provides targeted advice — not generic "add a symbol" tips, but specific weaknesses found in your test password.
The zxcvbn library runs entirely client-side. Your password input is never sent to any server. The library is loaded once from the Cloudflare CDN and then runs locally.
Frequently asked questions — Password Strength Visualizer
Is it safe to type my real password here?
We strongly recommend against it — use a test password instead. Although this tool is 100% client-side and nothing leaves your browser, it is good practice to never type real credentials into any third-party website.
What does the GPU crack time actually mean?
It estimates how long an attacker with a dedicated GPU cluster (capable of 10 billion hash attempts per second in an offline attack) would need to crack the password. For online attacks, rate limiting makes even weak passwords take much longer.
Why is my 12-character password rated "Fair"?
Length alone is not enough. If your password contains dictionary words, names, common patterns like "Password1!" or keyboard walks like "qwerty", the real search space is much smaller than the character count implies. zxcvbn models these patterns directly.
How is this different from the coloured bars on other sites?
Most password meters count character types (upper, lower, digit, symbol) and length — they give "Password1!" a "Strong" rating. zxcvbn models realistic attacker dictionaries and pattern-matching, so it correctly rates "Password1!" as Very Weak.
Comments & Feedback
Found a bug? Have a suggestion? We'd love to hear from you.
Related Tools
From the makers of this tool
Need deeper observability?
MonitorGiant tracks real-time AI performance, infrastructure health, and system reliability — far beyond what free utilities can show.