tool

Password Strength

Estimate how much entropy a password has and how long a fast offline attacker would need to crack it. An honest estimate based on character set and obvious patterns, not an oracle.

no upload nothing stored 1010 guesses/s
Type a password
estimated entropy: 0 bits
Entropy
0 bits
Character set
0
Length
0
Crack time @10¹⁰/s
—

    Formula: entropy = length × log₂(charset size), with penalties for repeats, sequences and common words. Crack time assumes the attacker finds the password halfway through the search space (2ⁿ⁻¹ guesses) at 10¹⁰ guesses per second, typical of an offline GPU attack on a fast hash.

    Runs entirely in your browser — nothing is sent to any server.