Password Strength Checker - Test Security Free

Type a password and it scores its strength, showing an estimated time it would take to crack.

The crack-time estimate is a well-known heuristic based on length and character variety, not a guarantee. Longer, random passwords always score better.

No. Checking happens entirely in your browser - your password is never sent, saved, or logged.

Length matters most. A long passphrase or a random mix of upper, lower, numbers, and symbols beats a short complex one.

It is safe since nothing leaves your device, but as a habit, test passwords similar to yours rather than the exact ones.

Entropy measures how unpredictable a password is to an attacker, and it grows with both length and character variety. Long, random passwords score high entropy, while short or word-based passwords stay easy to guess. The checker estimates this strength and translates it into a rating plus an assumed crack time.

A passphrase built from several unrelated random words can be stronger than a short password full of symbols, because length drives the total number of combinations. Four or more random words usually create a long, memorable credential. Avoid famous quotes or song lyrics, which attackers test early.

The estimate assumes an attacker making around ten billion guesses per second, but real attacks vary widely by hardware and method. Online attacks against a login page are usually far slower, because sites throttle attempts. Treat the crack time as an order-of-magnitude guide rather than a promise.

Common causes are short length, dictionary words, repeated characters or predictable patterns such as names, dates and keyboard walks. Lengthen it to at least 16 characters, mix upper and lower case with numbers and symbols, and generate a fresh random password instead of decorating an old weak one.

The check runs entirely in your browser, so the safest habit is still to test a lookalike password instead of typing a live credential exactly as you use it. You get an honest reading of its strength without entering an active password anywhere, which is good practice on any website.