— Ingenious AI security check.
Key figure: The global average cost of a data breach was $4.44 million in 2025 (IBM, Cost of a Data Breach Report 2025).
Start with Have I Been Pwned (haveibeenpwned.com), the free lookup run by Troy Hunt that uses k-anonymity so your full address never leaves your browser. If you’re listed, change every reused password, enable two-factor authentication on important accounts, and watch for phishing emails that reference the breach.
A data breach is when attackers steal a database of user records — emails, passwords, personal details — from a company. Breaches fuel credential-stuffing attacks, which is why one leaked password can compromise many accounts.
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 data breach 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.
Run your address through Have I Been Pwned (haveibeenpwned.com), the free lookup run by security researcher Troy Hunt. It uses k-anonymity, so your full email never leaves your browser during the lookup. Never hand a lookup site your password — a real data breach check needs only your address.
No — and any site that claims to check your email against breach databases from a static page is either sending your email to a third party or making the answer up. The safe way is to check it yourself at Have I Been Pwned, which uses a privacy-preserving lookup.
Change the password everywhere you reused it, enable two-factor authentication on every important account, and watch for phishing emails that reference the breach. Then upgrade to a password manager and passkeys so the next breach cannot hurt you.
Yes. It is run by security researcher Troy Hunt, uses k-anonymity so your full email or password never leaves your browser during lookups, and is the industry-standard breach lookup service.