Coming soon
Email Breach Checker
This tool isn't available yet. When it launches, your email address will be checked privately — hashed on your device, never sent in full.
Coming soon
We're putting the finishing touches on it
In the meantime, the Password Checker already tells you whether a password has appeared in a known breach — using the same privacy-preserving technique.
Local hashing
Your address is SHA-1 hashed in your browser — only a short hash prefix would ever leave the device.
k-anonymity lookup
Matching happens on your device, so the full email is never transmitted or stored anywhere.
Launching soon
We're finalising the breach data source before opening this tool up.
Frequently asked questions
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