How to generate and store strong passwords safely

Length and unpredictability matter

Password strength is better understood as resistance to guessing than as compliance with a visual recipe. Human-created passwords often use names, keyboard paths, dates, substitutions such as “@” for “a,” or a predictable symbol at the end. Attackers build these patterns into guessing systems.

A random generator can choose each character independently from an allowed set. Increasing the length increases the number of possible results dramatically. Some sites impose unnecessary restrictions, so a practical generator should let you adjust length and character types without claiming that every configuration is equally strong.

Every account needs a unique password

Reusing one excellent password across several services creates a shared point of failure. If one service exposes it, an attacker can try the same email-and-password combination elsewhere. This is commonly called credential stuffing.

Uniqueness limits the damage. A breach involving one account does not automatically reveal the password for your email, financial services, workplace, or social accounts. Start with the email account used for password resets because access to that inbox can undermine many other accounts.

What a browser password generator should do

A security-focused browser generator should use the Web Crypto API rather than a general-purpose pseudo-random function intended for simulations or visual effects. Generation can happen locally: the resulting password does not need to be sent to a server.

Local generation does not protect a password after you copy it. Clipboard history, synced clipboards, screen recording, malicious extensions, and untrusted devices may expose copied values. Generate passwords on a trusted device, paste them directly into the intended account or password manager, and avoid leaving them in notes or messages.

Use a password manager for storage

People cannot reliably memorize a different random password for every account. A password manager stores those credentials in an encrypted vault and can fill the correct credential for the matching site. Choose a reputable manager, protect the vault with a strong master password, keep recovery information current, and understand how account recovery works before relying on it.

A password manager also helps detect look-alike domains because autofill is associated with a specific site. It is not a substitute for checking the address bar, but it can reduce the temptation to type a password into an unexpected page.

Add multifactor authentication

Multifactor authentication requires another proof beyond the password. Prefer phishing-resistant methods such as passkeys or hardware-backed security keys where available. Authenticator applications are generally stronger than relying only on SMS, although any supported second factor may reduce risk compared with password-only access.

Store recovery codes securely and separately from the device used for authentication. Test recovery before an emergency, especially for important business accounts.

When to change a password

Change a password when a service reports a breach, you entered it into a suspicious page, malware may have been present, another person learned it, or the same password was reused elsewhere. Arbitrary scheduled changes can encourage predictable variations and are not a replacement for breach detection.

If compromise is suspected, use a known-clean device, secure the associated email account, end active sessions, update recovery methods, review recent activity, and change any other account where the credential was reused.