See how strong your password really is, with an estimated time to crack — checked entirely in your browser, never sent or stored.
Password Strength Checker analyzes a password the same way an attacker would: it measures the raw entropy from its length and character variety, then checks it against a list of extremely common passwords and simple patterns like "abcd" or repeated blocks such as "abcabcabc" — the kinds of guesses dictionary and pattern-based attacks try first, long before brute force. A password that matches any of those is marked weak and its crack time shown as instant, no matter how random it looks on paper. The estimated time to crack assumes an offline attacker trying 10 billion guesses per second, a realistic pace for modern GPU hardware against a fast, unsalted hash — a deliberately cautious assumption, since a properly hashed account (bcrypt, Argon2, scrypt) would take far longer in practice. Everything happens locally: the password you type is never sent to a server, logged, or stored anywhere, not even temporarily.
Enter or paste a password into the field — nothing you type ever leaves this page.
See its strength rating, an estimated time to crack, and which character types it uses.
If it matches a common password or an easy-to-guess pattern, you'll see exactly why.
Checked entirely in your browser — never sent to a server, logged, or stored anywhere.
Based on entropy and a transparent, deliberately cautious guesses-per-second assumption — not a black box.
Flags common passwords, sequential runs and repeated patterns that raw entropy alone would miss.
Test as many passwords as you like, with no limits or hidden fees.