Password Strength Checker
Check password strength with 9 security rules. Estimates crack time using GPU brute-force speeds.
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About Password Strength Checker Online
Check password strength against 9 security rules and estimate crack time assuming 10 billion guesses/second (modern GPU). All checking is client-side — your password is never transmitted.
Password strength isn't just about length or including a symbol — real-world crack time depends on the total entropy (character set size raised to the power of length) versus the computing power available to an attacker, and modern GPU-based cracking rigs can attempt tens of billions of guesses per second against a stolen password hash. This tool checks your password against 9 concrete security rules (length, character variety, common patterns, dictionary words, and more) and estimates realistic crack time assuming a 10-billion-guess-per-second attack, giving you a genuinely useful sense of whether a password is actually strong rather than just superficially complex-looking. Nothing you type is transmitted anywhere — the check runs entirely in your browser.
How to use
- Paste or type your input directly into the editor — output updates in real time as you work.
- Check the error/status indicator if your input is invalid; it points to the exact line or issue where relevant.
- Use the copy or download button to grab the processed output once it looks right.
- Chain into a related tool below if your workflow needs a second processing step.
- Processing happens entirely client-side in your browser — nothing you paste is uploaded to a server.
Tool details
⚡ Next step — complete your workflow
Frequently asked questions
What makes a password strong?
16+ characters, mix of uppercase, lowercase, numbers, and symbols, no dictionary words, no keyboard patterns. A 16-char random password takes centuries to crack.
Is my password safe to type here?
Yes — all checking happens locally in your browser. Your password is never sent to any server. Check the network tab in DevTools to confirm.
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