Here is the truth most "breach checker" sites will not tell you: a static web page cannot safely check breach databases for you. Any site that asks for your email and instantly invents a verdict is either harvesting your address or making the answer up. Here is the honest 5-minute check instead.
Run by security researcher Troy Hunt. It uses k-anonymity, so your full email never leaves your browser during the lookup. Type your address there — not here.
Open Have I Been Pwned →Breaches hurt because one leaked password unlocks ten accounts. A password manager gives every site a unique password; passkeys remove passwords entirely where supported. Do this for email first — your inbox is the master key to everything else.
Change the password everywhere you reused it, turn on two-factor authentication on every important account, and expect phishing emails that reference the breach — attackers buy these lists and personalize their lures.
BreachHunter watches breach feeds for your addresses and alerts you the moment you appear in a new one — so you hear it from us first, not from a phisher.