Password Strength Checker
Analyzes a password entirely in your browser: estimated entropy, character variety, common patterns (sequences, repeats, keyboard walks, years) and the estimated time to crack at realistic attacker speeds.
Runs 100% in your browser — nothing you generate leaves your device.
Read the full guide to this tool
Notes
- The password is analyzed locally and never leaves this page — but as a rule, never type a real password you care about into any checker; use it to compare candidate styles instead.
- Entropy estimates assume the attacker knows your recipe. A word with predictable substitutions (P@ssw0rd) is far weaker than its character count suggests.
- Everything runs locally in your browser; nothing you enter or generate is sent to any server.
Explore the idea
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