Password Strength Checker
Check password strength with detailed analysis
How to Use Password Strength Checker
- 1Type or paste a password into the input field.
- 2See the strength meter update in real time.
- 3Review the detailed breakdown: length, character types, entropy and time-to-crack estimate.
- 4The tool warns if your password appears in common password lists.
About Password Strength Checker
Check how strong your password is with detailed analysis. See entropy score, character composition, estimated time to crack, and whether it appears in common password lists. The strength meter provides a visual score from Very Weak to Very Strong.
Frequently Asked Questions
Is my password sent to a server?
No. All analysis happens locally. Your password is never logged or stored.
How is password entropy calculated?
Entropy is calculated as log2(pool_size^length), where pool_size is the number of possible characters (26 for lowercase, 52 with uppercase, 62 with numbers, 95 with symbols). Higher entropy means more possible combinations.
What makes a password strong?
Length is the most important factor, followed by character variety. A 16+ character password with mixed case, numbers and symbols is considered very strong. Avoid dictionary words, personal info and common patterns.