Password Security: Practical Habits for Stronger Accounts
A strong password is difficult to guess and is not reused across accounts. Length and uniqueness matter more than adding predictable substitutions such as changing “a” to “@”. Since people cannot reliably memorize a different complex password for every service, a reputable password manager can create and store unique credentials.
Use long, unique passwords
Use a long passphrase or a randomly generated password for each account. Reuse creates risk: if one service is breached, attackers may try the exposed credential on other sites. Never share passwords, and change one promptly if you believe it has been exposed.
Enable multifactor authentication
Where available, enable multifactor authentication (MFA), preferably with a passkey or an authenticator method supported by the service. MFA adds a second proof of identity, so a stolen password alone is less likely to grant access. Keep recovery codes somewhere safe and private.
What a password strength checker can tell you
A checker can provide an educational estimate based on characteristics such as length and character variety. It cannot guarantee that a password is unguessable, determine whether it has appeared in a breach, or replace a password manager and MFA. Do not enter a password you actually use into a website. If you try the Securnix password strength checker, use a made-up example only.
Related cryptography topics
Learn why password storage needs purpose-built password hashing in our hash generator guide, or explore the cryptography guide for beginners.