Password Breach Check
Check whether a password appears in known data breaches using the HIBP range API — only the first 5 hash characters ever leave your browser.
About Password Breach Check
Check whether a password appears in known data breaches using the HIBP range API — only the first 5 hash characters ever leave your browser.
Password Breach Check does the security work in your browser using well-known algorithms, so sensitive input never has to be sent to a remote server.
How to Use Password Breach Check
- Enter the secret text, file or value you want to process.
- Choose the algorithm, key or options required.
- Run the operation — the output appears instantly and locally.
- Copy the result safely.
Key Features
- Encryption and hashing run locally — your secrets stay on your device.
- Uses established, well-documented algorithms and standards.
- No account, no key storage, no data retention.
Frequently Asked Questions
Is Password Breach Check safe to use with sensitive data?
Yes. Password Breach Check runs entirely inside your browser using in-page cryptography, so your inputs are never uploaded, logged or shared.
Is Password Breach Check free to use?
Yes. Password Breach Check is completely free with unlimited use — no account, download or payment required.
Is my data uploaded to a server?
No. Password Breach Check runs entirely in your browser. Your inputs are never sent to our servers or stored anywhere.
Does Password Breach Check work on mobile?
Yes. The interface is fully responsive and works in any modern browser on Android, iPhone, tablets and desktops.