SHADOWKEY

Check how strong a password really is, and make strong ones you can actually remember, without any of it leaving your device. Most password checkers online send what you type to a server. SHADOWKEY does the whole thing in your browser, so the password never travels anywhere.

How strong is this password?

Nothing you type here is sent anywhere. Turn off your wifi and it still works.

Make a strong passphrase

Custom password generator

SHADOWKEY runs entirely in your browser and never sends or stores what you type. The strength estimate is a transparent model (character variety and length, minus penalties for common passwords, keyboard patterns, sequences, repeats and dates); it is a helpful guide, not a promise. Generated passphrases and passwords use your browser's secure random generator. For real safety, use a unique password for every account and keep them in a password manager.