Password Strength Checker
Instantly analyze how strong your password is — entropy, crack time, and detailed criteria. 100% local, nothing is ever transmitted.
Enter a password above
Start typing to see your password analysis.
How it works
1
Type your password
Enter it in the field above. It never leaves your browser — all analysis is purely local JavaScript.
Enter it in the field above. It never leaves your browser — all analysis is purely local JavaScript.
2
Criteria check
The tool instantly checks length milestones, character variety (uppercase, lowercase, digits, symbols) and calculates the entropy in bits.
The tool instantly checks length milestones, character variety (uppercase, lowercase, digits, symbols) and calculates the entropy in bits.
3
Crack time estimate
Based on entropy and an assumed offline attack rate of 10 billion guesses/second, we calculate a rough worst-case crack time.
Based on entropy and an assumed offline attack rate of 10 billion guesses/second, we calculate a rough worst-case crack time.
4
Improve it
Use the checklist to see which criteria you're missing. Aim for at least 80 bits of entropy (Strong or Very Strong rating).
Use the checklist to see which criteria you're missing. Aim for at least 80 bits of entropy (Strong or Very Strong rating).