Password Breach Checker
Check if your password has appeared in known data breaches.
About this tool
Check if your password has been exposed in known data breaches using the HIBP database Password Breach Checker runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.
What this tool does not do
- Password Breach Checker is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.
How do I use this tool?
How do I use Password Breach Checker?
Open Password Breach Checker, enter or paste your input, and copy the result. The page works without an account.
Related guides
Related tools
AES Encryption
Encrypt and decrypt text with AES-GCM and a passphrase, fully in your browser. Uses PBKDF2 key derivation and the Web Crypto API — your data and keys never leave your device.
Basic Auth Generator
Generate an HTTP Basic Authentication header from a username and password. Produces the Authorization header and ready-to-use curl and fetch snippets. Runs fully client-side.
Bcrypt Generator & Verifier
Hash passwords with bcrypt and verify hashes — choose your cost factor (rounds 4–15), get a secure hash instantly, and check whether a password matches a hash. Runs entirely in your browser.
BIP39 Mnemonic Generator
Generate and validate BIP39 seed phrases locally for testing
Checksum Calculator
Compute file checksums (SHA-1, SHA-256, SHA-384, SHA-512) in your browser with the Web Crypto API
Client-Side File Encryptor
Encrypt any file with AES-256-GCM and PBKDF2 directly in your browser — no uploads, no accounts, wrong passwords fail loudly.