Free Tool
Password Strength & Breach Checker
Check if your password has appeared in known data breaches — without sending it anywhere. Strength analysis is instant and local.
Breach check uses Have I Been Pwned's k-anonymity API — your actual password never leaves your browser.
How the breach check works
- 1Your password is hashed with SHA-1 entirely in your browser
- 2Only the first 5 characters of the hash are sent to Have I Been Pwned
- 3The API returns all hashes starting with those 5 characters
- 4Your browser checks the list locally — your password never travels the network
Password Best Practices
Use a passphrase
4+ random words are easier to remember and hard to crack
Never reuse passwords
One breach = all accounts exposed if you reuse
Use a password manager
1Password, Bitwarden, or similar — generate unique passwords per site
Enable MFA everywhere
Even a weak password is much safer with two-factor authentication
Need help securing your business accounts?
We set up password managers, MFA, and SSO for Sonoma County businesses. One afternoon — done.
Talk to Us