Has Your Email Been Breached?
Check if your email has been exposed in known data breaches. Free, instant, and completely private.
100% Private: Your email is never stored. We use k-anonymity to check breaches without sending your full email to external servers.
Powered by Have I Been Pwned
This tool uses data from Have I Been Pwned, the world's largest collection of breached data. Founded by security expert Troy Hunt, HIBP has tracked over 13 billion compromised accounts across 600+ breaches.
Learn more about HIBPHow It Works
You Enter Your Email
Simply type in the email address you want to check. Your email stays in your browser.
Secure Query via HIBP
We check Have I Been Pwned's database of 13B+ compromised accounts using their secure API.
Instant Results
Get a complete report showing which breaches exposed your email and what data was compromised.
Behind the Scenes: Privacy & Technology
We believe in complete transparency about how your data is handled and where breach information comes from.
Zero-Knowledge Checking
Your full email is never sent to external servers. We query using k-anonymity, a privacy technique where only a partial hash is transmitted.
Transparent Data Source
All breach data comes from Have I Been Pwned, a trusted, publicly-audited database maintained by security expert Troy Hunt since 2013.
Real-Time Database
HIBP continuously monitors and adds new breaches. The database is updated regularly with verified breaches from across the internet.
No Data Storage
We never log, store, or track the emails you check. The search happens client-side and results are never saved on our servers.
What is k-Anonymity?
K-anonymity is a privacy technique where we hash your email and only send the first 5 characters of that hash to HIBP's servers. The server returns all breaches matching that prefix (thousands of results), and we check locally in your browser which ones match your full email hash. This means HIBP never sees your actual email address or even your complete hash—only a tiny prefix that could match thousands of emails.
Want Real-Time Protection?
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