Password Strength Checker Online

The service analyzes password strength directly in the browser: length, character set, entropy and presence of weak patterns (sequences, repeats, common words).

How Strength is Assessed

• Entropy — measure of unpredictability: bits = log₂(N^L), where N is the alphabet size, L is the length. Recommended ≥ 60 bits.
• Length — key factor; each additional character exponentially increases brute-force time.
• Character classes — lowercase, uppercase, digits, special characters expand the alphabet.
• Patterns — sequences (123, abc, qwerty), repeats (aaa) and dictionary words reduce actual entropy.

Recommendations

• Use a password manager to generate random passwords of 20+ characters.
• For memorable passwords — a passphrase of 5+ random words (diceware).
• Never reuse a password across multiple sites.