Real-time strength analysis — your password never leaves the browser.
The service analyzes password strength directly in the browser: length, character set, entropy and presence of weak patterns (sequences, repeats, common words).
Entropy is a measure of a password's unpredictability, expressed in bits. The higher the entropy, the more combinations an attacker must try to crack it. This tool calculates entropy based on password length and character set diversity. A password with 60 bits of entropy is exponentially harder to crack than one with 30 bits, making entropy the primary indicator of resistance to brute-force attacks.
No, that is not possible. The password strength check on 101IP runs entirely on your device in the browser using JavaScript. Your password is never transmitted over the network, stored on a server, or logged in any way. The analysis is strictly local — no data leaves your browser at any point.
Length alone is not sufficient. A 15-character password composed entirely of lowercase letters is still vulnerable to dictionary attacks and pattern-based brute force. Its entropy is lower than that of a shorter password mixing different character types. For a high strength score, always combine uppercase letters, digits, and special characters, and avoid recognizable words or sequences such as "abcdefghijklmno".