See how long it would take a computer to crack your password.
Password strength is measured in bits of entropy, which represents the number of guesses an attacker would need in a brute-force attack. Each bit of entropy doubles the number of possible passwords. A password with 40 bits of entropy has 2^40 (about 1 trillion) possible combinations. A password with 80 bits has 2^80 (about 1.2 x 10^24) combinations. Modern security standards recommend at least 60-80 bits of entropy.
Type or paste a password and the calculator instantly shows its entropy in bits, the estimated time to crack it at various attack speeds (from a personal computer to a nation-state attacker), the character set detected, and a strength rating (very weak to very strong). The password never leaves your browser; all analysis is done locally.
Common words: "password123" can be cracked in milliseconds because it appears in every dictionary attack list. Personal information: Birthdates, pet names, and addresses are easily guessed by attackers who know you. Simple patterns: "qwerty," "123456," and keyboard walks are in every attack database. Short length: An 8-character password using all character types has only 47 bits of entropy, which modern GPUs can crack in hours. The Password Generator creates truly random passwords that avoid all these weaknesses.
Password strength is measured in bits of entropy, which represents the number of possible combinations an attacker must try. A truly random 8-character password using uppercase, lowercase, digits, and symbols has about 52 bits of entropy (approximately 6.6 quadrillion combinations). However, humans rarely create truly random passwords: common substitutions (@ for a, 3 for e, ! at the end) are well-known to attackers and add minimal security. Modern best practice recommends passphrases of 4+ random words (e.g., "correct horse battery staple"), which are both stronger and easier to remember than complex short passwords. A 4-word passphrase from a 7,776-word list provides approximately 51 bits of entropy. Password managers are the most practical solution for maintaining unique, strong passwords across hundreds of accounts.