Password Strength Checker — Free Online Tool

The Password Strength Checker estimates how resistant a password is to being guessed, scoring it on length, the mix of character types, and whether it matches obvious patterns — dictionary words, keyboard runs like qwerty, repeated characters, dates, and the predictable substitutions (@ for a, 3 for e) that people assume are clever and cracking tools check first.

Length is the factor that dominates, and by a wider margin than most password advice implies. Each additional character multiplies the search space, so a long passphrase of ordinary words beats a short string of symbols comfortably — "correct horse battery staple" is genuinely harder to brute-force than "P@ssw0rd!" despite looking less technical. The complexity rules many websites enforce mostly push people toward short, memorable-but-predictable passwords, which is the opposite of what helps.

An important limit on any strength meter: a score only measures resistance to guessing. It cannot tell you whether a password has already appeared in a breach, and a password that leaked from another site is compromised no matter how strong the meter says it is. Unique passwords per site, stored in a password manager, is the part that actually protects you.

The password you type is analysed entirely in your browser using local pattern rules. It is never transmitted, logged, or stored — but as a matter of habit, testing a variation of a real password rather than the password itself is the safer instinct on any site.

Our Password Strength Checker is completely free to use with no signup required. For this tool, processing runs in your browser — your files and data stay on your device and are not uploaded to our servers.

Whether you are a developer, designer, student, or business owner, this tool is designed to save you time and make your workflow more efficient. Bookmark this page to access it whenever you need it — it will always be free.